Karlyn STI® - Spark Plug Wire Set

514 reviews|Item # sp3252
$10.99 - $434.78
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Product Details

Spark Plug Wire Set by Karlyn STI®. The purpose of good wire insulation is to protect the cable from voltage leaks. The single most important factor for rating insulation performance is the type of material used and not the diameter of the wire.

Karlyn STI


  • Spiral core
  • Stainless steel magnetic conductive winding
  • Improves gas mileage and engine performance
  • Superior voltage protection
  • Includes specially designed durable boots
  • Corrosion-resistant / Oversized clip-lock terminals

Karlyn STI® is recognized worldwide as one of the most proven and reliable manufacturers of ignition and suspension parts in the automotive aftermarket. The brand's history traces back to 1971 when German engineer Hans Bierdumpfel founded Karlyn STI, after working on leading positions in several respected companies in the USA. At first the company produced VW ball joints and tie rod ends, and further expanded into manufacturing suspension parts and high-performance spark plug ignition cable sets for a range of vehicle applications. Today, Karlyn STI product lines are admired by automotive fans for their unmatched performance and superior durability.

Warranty Information

A Spark Transfer International (STI) Coil on Plug (COP) Warranty and Diagnosis

Karlyn Industries/STI distributes high-quality COP components. The manufacturer utilizes independent engineers to monitor their coils and test warranties. Most coils that are returned DO NOT have a problem. Rough running engines that set misfire codes can have multiple causes. It is the responsibility of the dealer/installer of Karlyn STI products to verify that the following items of inspection have been performed, in order to comply with warranty replacement.

General misfire codes are most likely due to an intake vacuum leak or fuel delivery problem. Misfire codes identifying a particular cylinder are usually due to a fouled spark plug, dirty or dead fuel injector or loss of compression in the cylinder (burned or bent valve, weak or broken valve spring, or leaky head gasket.)

If the crankshaft position sensor fails, the loss of the basic timing signal will prevent the system from generating a spark and the engine will not start or run. A failed driver circuit within the powertrain control module (PCM) can kill an individual coil and prevent that cylinder from firing. Replacing the coil without addressing the cause will only result in another damaged coil.

Misfire codes can also be triggered from a damaged wire harness due to poor grounds. Inspect the wire harness carefully. You may have to cut back the insulation to verify that there is no corrosion or melting of the wire harness due to poor grounds.

A faulty harness can cause the coil to fail. If you simply install a new COP, it may seem like you have corrected the problem but, merely replacing the coil without repairing the grounding problem may result in future coil failures. In summary, it is important to remember that ignition misfire can also be caused by other factors such as worn or fouled spark plugs, loose or damaged coil connectors or terminals, dirty fuel injectors, low fuel pressure, intake vacuum leaks, loss of compression in a cylinder, even a tank full of "bad" gas contaminated with water. These other possibilities should all be ruled out before a COP unit is replaced.

Note: A fouled spark plug can damage the COP. Karlyn STI recommends that you always replace the spark plugs when you replace the COP units & that all the ignition coils be replaced at the same time. As a form of preventive maintenance, the manufacturer suggests this be done every 60,000 miles. Karlyn STI warrants their coils to be free from factory defects for the period of 12 months or 12,000 miles.

The main goal here is a real solution to your ignition problem which will result in happy customers. Temporary solutions will only result in the return of non-defective parts and in unhappy customers who will continue to have the same problem.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Product Reviews


Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

Karlyn STI® - Spark Plug Wire Set
Karlyn STI® - Spark Plug Wire Set
Average Rating: 4.8 of 5
5 of 5
Awesome Product
Theses spark plug wires work great they hook right up with no trouble. They were all the perfect length too, so you don’t have to cut them. The blue wires also look very good in the engine bay.
Posted by (Springs, PA) / 2008 Subaru Impreza
Was this review helpful for you? Yes
5 of 5
Definite Difference
I've only had them and some new plugs on for 2 days but i definitely noticed a power increase.
Posted by (Conover, NC) / 2002 Hyundai Santa Fe
Was this review helpful for you? Yes
3.5 of 5
Does Not Match OEM Spec
They look cool, work fine, but are not built correctly. The boots are slightly to long so the covers don't go all the way down. There is a gap between the cover and the valve cover, so water can get into the spark plug hole. That is the purpose of having that piece there, to seal that up. And no, you can't just trim a little off, because the part that snaps onto the plug is set down so far, it is the limiting factor. The wires are also to long, all of them. About a inch to long. Doesn't sound like much but these go through guides all the way and you have to figure out how to route the extra wire at the end somehow, without making it hit any metal. There is a lot of metal to hit, that's why the length is important. What I really don't get is how that can get screwed up. Didn't they take a stock Subaru set and check them before they built these?
Posted by (Orem, UT) / 2005 Subaru Outback
Was this review helpful for you? Yes
4 of 5
Good Value For Money
Price is good but has some flaws. Length does not match original cables. Some are spot on but other are +-.5" so installation does not look as neat as with the OEM cables. The caps on the distributor side are slightly larger than OEM so the plastic cover over the distributor gets hard to fit. Cables ranged from 980 to 1123 ohms.
Posted by (Santa Cruz, CA) / 1986 Mercedes S Class
Was this review helpful for you? Yes
5 of 5
Karlyn Spark Plug Wires
Product looks great, I love the sporty blue car ran smoother with performance and acceleration. I bought these wires because to replace old ones and also the design of these wires is a big factor due to how the distributor connections are made very well and have number clips on the wires themselves for installation! Definitely A+++ for quality design and performance!
Posted by (Marysville, WA) / 1997 Mazda 626
Was this review helpful for you? Yes
4.5 of 5
Karlyn STI Wires
Excellent fit, reasonable price and fast shipping. Definite five out of five.
Posted by (Inverness, FL) / 1998 Ford Explorer
Was this review helpful for you? Yes
5 of 5
So Far So Good
Good quality for the price. Just installed coil and plug wires. Too soon to tell if any improvement on gas mileage. I have peace of mind that they have been charged.
Posted by (Las Cruces, NM) / 2009 Chevy Silverado
Was this review helpful for you? Yes
5 of 5
New Spark Plug Wires!
They came early, good price. They work great, I love them!
Posted by (Bluff City, TN) / 2004 Hyundai Tiburon
Was this review helpful for you? Yes
5 of 5
High quality ,and its made in Germany.
Posted by (Calgary, AB) / 1995 Toyota Corolla
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5 of 5
Karlyn STI Wires
The product is excellent quality.
Posted by (Oceanside, CA) / 1996 Saturn S-Series
Was this review helpful for you? Yes
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