2003 Honda Civic Si Performance Parts

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    • (2 reviews)
      # mpn1097930
      Honda Civic Si Hatchback 2003, Street Series™ Stainless Steel Cat-Back Exhaust System with Dual Rear Exit by MagnaFlow®. Exhaust Type: Cat-Back. Exhaust Tubing Material: Stainless Steel. Main Tubing Diameter: 2.25". Exhaust System...
      $511.20
    • (1 review)
      # 62025801
      Honda Civic Si 2003, 1-Click Street Warrior Z26 Drilled and Slotted Front Brake Kit by Power Stop®. Specially designed for high performance street drivers who demand shorter stops under the most extreme conditions, this brake kit is a...
      $154.72 - $252.00
    • (2 reviews)
      # mpn2883468074
      Honda Civic Si Hatchback 2003, Kontrol Pro Front and Rear Lowering Coilovers with 0.5"-2.5" Front and Rear Body Drop by KSport®. Quantity: Sold as a Kit. Ksport Kontrol Pro Fully Adjustable Coilover Kits provide the ultimate in...
      $873.00
    • (0 reviews)
      # 377202013
      Honda Civic Si / Civic SiR 2.0L 2003, Aluminum Cold Air Intake System by AEM®. To deliver cooler air to the engine, this air intake system places the air filter outside the engine compartment. Cooler air is denser than warm air and so...
      Delivers more oxygen to the combustion chamber by drawing in cooler airCustom designed and engineered to deliver maximum power for each specific vehicle
      $287.99
    • (1 review)
      # mpn4478770697
      Honda Civic Si 2.0L 2003, V-Force Plus Performance Module by JET®. The JET V-Force Plus features the same power tuning technology found in JET’s performance modules/programmers. The JET V-Force Plus is an inline tuning device that...
      Improve horsepower and throttle responseOptimized ignition advance curves
      $274.46
    • (0 reviews)
      # mpn4498420517
      Honda Civic Si / Civic SiR 2.0L 2003, Crankshaft by Brian Crower®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $2,017.88
    • (0 reviews)
      # mpn195390508
      Honda Civic Si / Civic SiR 2.0L 2003, Performance Aluminum Radiator by Mishimoto®. The Mishimoto performance aluminum radiator is designed and engineered to maximize cooling efficiency, boost engine functions, and most importantly...
      Full Aluminum Construction including durable, TIG-welded end tanksIncreased fluid capacity and optimal heat dissipation
      $255.00
    • (0 reviews)
      # mpn487479990
      Honda Civic Si / Civic SiR 2.0L 2003, Stage 1 Clutch Kit by SPEC®. Does not Include: Flywheel. Clutch Torque Rating: 185 ft/lbs. Features an integrally molded carbon kevlar-based, high performance organic lining that offers smooth...
      High clamp pressure plateSteel-backed and multi-compound woven organic material
      $323.10
    • (0 reviews)
      # mpn4530951296
      Honda Civic Si 2.0L 2003, E85-Compatible High Flow In-Tank Electric Fuel Pump by AEM®. The AEM High Flow, High Pressure Fuel Pump for high performance naturally aspirated and forced induction EFI vehicles. The High Flow, High Pressure...
      Designed for high output naturally aspirated and forced induction EFI vehiclesPopular “044 Style” physical configuration but with AN inlet and discharge port connections
      $114.99
    • (0 reviews)
      # 1015755852
      Honda Civic Si / Civic SiR 2.0L 2003, Premium EVO Nickel Spark Plug by Brisk®. With Resistor. Unique Spark Plug Produced Patented Laser Technology Unique igniter auxiliary electrode at the tip of the insulator formed using the patented...
      Perfect ignition of fuel mixture in engine cylindersUnrestricted flame throughout combustion chamber
      $14.99
    • (1 review)
      # 1090211116
      Gear Box by Helix®. If you are looking to upgrade the steering system of your vehicle to make the most out of your vehicle’s performance, go with this high-grade steering part that is engineered to be second to none when it comes to...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $227.99 - $731.45
    • (0 reviews)
      # 985154426
      Universal Advanced Lightweight 12V AGM Battery by Braille Battery®. Battery Type: AGM. Voltage: 12V. Batteries have always presented the same problems of weight, safety, and cost. In racing, aerospace, and advanced technology...
      Proudly Made in the USASealed absorbed glass mat (AGM) design that incorporates special glass fiber mats that contain the acid electrolyte between the lead plates, rather than a standard flooded (liquid) design
      $149.99 - $229.99
    • (0 reviews)
      # 86315966
      Honda Civic Si 2003, Level 2.9™ Axle Shaft by Driveshaft Shop®. In company ongoing quest for the perfect axle we have hit the mark with our new Level 2.9™ axle. These axles have been designed with the fast street car and all motor...
      Designed for unprecedented off-road performance under harsh, unforgiving conditionsPerfect solution for building a solid axle assembly that will handle extreme loads
      $419.99
    • (0 reviews)
      # 48222560
      Club X-1 Full Face ATM (Advance Thermo Material) Racing Helmet by Sparco®. Certification: ECE 05; Material: ATM (Advance Thermo Material) Designed for indoor kart racing where a fire proof helmet isn't required, this product is...
      Designed for indoor kart racingProvides ultimate protection
      $140.00
    • (0 reviews)
      # 450479564
      Universal PowerPack™ Turbocharger System by Banks®. The Banks Power Dual Exhaust PowerPack System is the complete towing package your pickup truck, with extended cab short bed configuration, deserves.
      Stunning Top GainsImproved Mileage
      $2,198.00 - $2,798.00
    • (0 reviews)
      # 1119814676
      Honda Civic Si 2003, Stainless Steel Cat-Back Exhaust System with Single Rear Exit by Torxe™. Exhaust Type: Cat-Back. Exhaust Tubing Material: Stainless Steel. Exhaust System Sound: Aggressive / Loud. This product is made of...
      $177.50 - $225.00
    • (0 reviews)
      # mpn1769239
      Honda Civic Si 1.7L 2003, 1-Click Z23 Evolution Sport Drilled and Slotted Front Brake Kit with Calipers by Power Stop®. Get superior benefits of ceramic pads and cross-drilled rotors in the Power Stop 1-Click Brake kit. These components...
      $238.21
    • (0 reviews)
      # 629264206
      Honda Civic Si 2003, H-Brace by Megan Racing®. As you drive your car undergoes stress as your whole chassis will twist and absorb a lot of energy created by the force of inertia and gravity. Over the years, it s been proven that a...
      Made with quality and safety in mindThe highest grade materials and the latest technologies
      $89.51
    • (3 reviews)
      # 377202042
      Honda Civic Si / Civic SiR 2003, SP Series Short Ram Air Intake System by Injen®. The Short Ram SP Series is a traditional, underhood air intake system that takes the place of your factory airbox and air filter, and the factory air...
      Improves airflow into the engineUses the patented MR Technology tuning process to ensure the air/fuel ratio is within optimum limits
      $198.41
    • (0 reviews)
      # mpn4478770640
      Honda Civic Si 2.0L with EP3 Chassis 2003, Speed Limit Defencer by HKS®. Most of JDM vehicles are equipped with speed limiter function. With this function, the vehicle's speed cannot exceed 180km/h. On the other hand, the performance of...
      HKS found the way to pick up the speed signal from other signals transmitted by CAN communication system to eliminate the speed limiter.The original control method of CAN communication system enables the vehicle's digital speed meter to indicate the speed over 180km/h.
      $135.60
    • (0 reviews)
      # mpn4498420698
      Honda Civic Si / Civic SiR 2.0L 2003, Lightweight Crankshaft by Brian Crower®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $2,017.88
    • (0 reviews)
      # 290230
      Honda Civic Si / Civic SiR 2003, Silicone Radiator Hose Kit by Weapon-R®. Quantity: 2 Pieces. Get better radiator hoses and dress up your engine compartment at the same time. These hoses are superior to the OEM. Made of the high temp...
      Provides heat reduction and increased pressure toleranceMade of high grade silicone
      $79.61
    • (1 review)
      # 159799891
      Honda Civic Si 2003, Stage 1 Sport Racing Clutch Kit by EXEDY®. Disc Type: Ductile Casting. Material: Organic. Number of Discs: 1. Up the ante with an EXEDY Stage 1 Organic Disc racing clutch kit. If you've bumped up your horsepower a...
      Ultra-Fiber organic disc with EXEDY exclusive friction compositionHigh Heat resins bond friction fibers
      $279.98 - $616.11
    • (0 reviews)
      # mpn2451628
      Honda Civic Si 2.0L 2003, Composite Fuel Rail by Skunk2®. Made from proprietary carbon-impregnated, aerospace thermo-polymer composite that is 33-percent lighter, 60-percent stronger, and operates up to 100-degrees F cooler compared to...
      Designed to provide increased horsepower and torqueInsulates fuel from both radiant and conductive heat transfer 
      $205.99
    • (0 reviews)
      # mpn4498087323
      Honda Civic Si / Civic SiR 2.0L 2003, Iridium Yttrium Performance Spark Plug by Brisk®. With Resistor. Iridium Yttrium Performance Spark Plug are the best solution for high performance and racing engines. Iridium Yttrium Spark Plugs...
      Iridium is 6X harder & 8X stronger than platinumLong lasting OEM performance replacement
      $10.99
    • (0 reviews)
      # mpn3990109742
      Vega Manual Steering Gear Box Kit by Helix®. This box offers new bearings and gears for smooth, comfortable steering. Provides a smooth, natural steering wheel return. If you are looking to upgrade the steering system of your vehicle to...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $514.84
    • (0 reviews)
      # 985212620
      Universal Carbon Fiber Advanced 12V AGM Battery by Braille Battery®. Battery Type: AGM. Voltage: 12V. Sealed Valve Regulated Design - Completely eliminates acid spills and corrosion on terminals. Environmentally safe and does not need...
      Proudly Made in the USASealed absorbed glass mat (AGM) design that incorporates special glass fiber mats that contain the acid electrolyte between the lead plates, rather than a standard flooded (liquid) design
      $324.99 - $374.99
    • (0 reviews)
      # 83877474
      Honda Civic Si 2003, Level 0™ Axle Shaft by Driveshaft Shop®. This is a new axle designed and made for basic swaps and is an alternative to cheap rebuilds. This is not a racing axle in any way, shape or form; Company offer this axle...
      Designed for unprecedented off-road performance under harsh, unforgiving conditionsPerfect solution for building a solid axle assembly that will handle extreme loads
      $157.49
    • (0 reviews)
      # 69025922
      110 Series Single Layer Racing Suit by RaceQuip®. Avaliable in Colors: Black, Blue, Red. Get superior durability and comfort combined with overall flame and heat protection. Strong construction and advanced sewing techniques make this...
      Ensures heat and fire protectionGentle fabric provides superior comfort
      $99.95 - $139.95
    • (0 reviews)
      # 1119770632
      Honda Civic Si 2003, N1™ Stainless Steel Cat-Back Exhaust System with Single Rear Exit by Invidia®. Exhaust Type: Cat-Back. Exhaust Tubing Material: Stainless Steel. Main Tubing Diameter: 2.36". Exhaust System Sound: Moderate. For a...
      $462.70




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    CARiD is the ultimate source for premium-quality performance parts. With our extensive collection of performance upgrades, adding onto your vehicle's performance or improving its look is safe and easy. Boost the interior of your 2003 Honda Civic Si with a set of racing seats, raise or lower your vehicle for an aggressive look, or add a set of high-performance brake rotors for superior braking. Unlock the hidden potential of your 2003 Honda Civic Si that has been waiting to be released!

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    Useful articles fast to read and guides easy to understand written by mechanics and car enthusiasts to turn your shopping experience with CARiD into a pleasure

    • Suspension Parts
      July 11, 2018
      When Is It Time To Replace My Suspension Bushings?
      Maybe you remember being pushed along in a wheelbarrow during childhood. The ride was bone-jarring - even with an air-filled rubber tire cushioning against the rough...
      by Timothy Zahl
    • Engine Parts
      May 21, 2018
      How To Remove An Engine
      If you've grown tired of your engine's declining performance, inconsistent power, rough idle, exhaust smoke, knocking noises, rattles, and other maladies that plague...
      by Richard Reina
    • Engine Parts
      May 09, 2018
      How Does An Internal Combustion Engine Work?
      An engine that uses liquid fuel to create energy, such as an internal combustion engine, is basically a large air pump. Cool air is drawn in, mixed with the fuel of...
      by Timothy Zahl
    • Engine Parts
      May 02, 2018
      Glossary Of Engine External Parts
      Internal combustion engines are extremely complex and feature a wide array of components that rotate, pump, pressurize, or seal. Many of these components, while...
      by Timothy Zahl
    • Performance Engine Parts
      April 20, 2018
      What You Need When Rebuilding Or Replacing An...
      So you’ve decided to take on the project of rebuilding or replacing your vehicle’s engine. Modern internal combustion engines are quite complex – with a wide...
      by Richard Reina
    • Shift Knobs
      January 19, 2018
      Shopping Guide – Shift Knobs
      The knob at the end of your gearshift lever probably isn't something that most people notice when getting into your car or truck. But for a minimal cost, it can be. We...
      by Timothy Zahl
    • Running Boards
      November 29, 2017
      Shopping Guide - Running Boards
      Running boards date as far back as the automobile itself, being integrated into car and truck designs until falling out of favor after World War II. With the boom in...
      by Timothy Zahl
    • Off-Road Bumpers
      November 28, 2017
      Shopping Guide – Off Road Bumpers | Custom...
      There's a saying that advises out of all the paths you take in life, it's important to make sure a few of them are dirt. But while dirt can be found most anywhere you...
      by Timothy Zahl
    • Automotive Tools
      August 30, 2017
      What Special Tools Are Available For Exhaust...
      Exhaust work can be challenging. Old parts are usually corroded and difficult to separate, and new ones sometimes need minor fitment adjustments during installation....
      by Timothy Zahl
    • Automotive Tools
      August 24, 2017
      What Special Tools Are Available For Fuel...
      Maintenance and repair work on fuel systems must be done with precision, no matter what part of it you're working on. Tools specifically designed for use on fuel...
      by Timothy Zahl
    • Automotive Tools
      July 12, 2017
      What Special Tools Are Available For Driveline...
      The expression "heat and beat" applies to a lot of driveline repairs, meaning worn parts are often so difficult to separate that one must use a blowtorch and great...
      by Michael Grayen
    • Batteries & Power
      May 22, 2017
      High-End Audio Demands Its Own Battery Source
      When you're driving and headlights start to dim because a high-powered stereo is cranking, that means the deep bass you hear is causing total vehicle electrical draw...
      by Timothy Zahl

    2003 Honda Civic Si Performance Parts Reviews

    Average rating:  4.5  4.5 - 3 reviews
    5 of 5
    Good Quality.
    Slight threading difference, but no problem.
    WPosted by William Polson (Vinita, OK) / January 18, 20182003 Honda Civic Si
    Was this review helpful for you? Yes
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