Pontiac Firebird 5.7L 1991-1992, 3" Adj™ Stainless Steel Cat-Back Exhaust System with Quad Rear Exit by Borla®. Exhaust Type: Cat-Back. Exhaust Tubing Material: Stainless Steel. Main Tubing Diameter: 3". Exhaust System Sound: Aggressive / Loud. This unique system allows you to adjust your level of sound and power, from quiet and restrictive to louder and free flowing. It features a patented Borla straight-through muffler and mandrel bent pipes constructed from aircraft grade austenitic stainless steel, and it’s backed by Borla’s unequalled one million mile warranty.
|Exhaust Type: Cat-Back|
|Exhaust Tubing Material: Stainless Steel|
|Exit Location: Quad Rear|
|Main Tubing Diameter: 3"|
|Exhaust System Sound: Aggressive / Loud|
|Tip Quantity: 4|
|Tip Material: Stainless Steel|
|Tip Outlet Diameter: 2.5"|
|Tip Length: 7"|
|Tip Shape: Round|
|Tip Cut Type: Angle-Cut|
|Hardware Included: Adapters needed to match the different pipe diameters coming out of the catalytic converters of the period|
- A selection of block-off plates allows you to adjust exhaust flow
- Plate with larger hole for increased power and a more aggressive exhaust note
- Plate with smaller hole for quieter operation
- Custom designed for each application
- Patented straight-through muffler design reduces backpressure while absorbing sound waves
- Mandrel-bent stainless steel tubes with diameters optimized for reduced restriction while maintaining exhaust gas speed
- Made from the finest austenitic stainless steel for long-lasting durability
- All welded construction
- Includes polished exhaust tips
- Includes everything required for installation, including detailed instructions
- Backed by the exclusive Borla Million-Mile warranty
- Proudly made in the USA
Imagine being able to change the sound of your car and its power level with just 3 bolts! That’s how many bolts retain the block-off plate on the Borla 3” Adjustable Series Stainless Steel Cat-Back Exhaust System. Borla starts by giving you the best raw materials:
The patented straight through muffler design reduces restriction and increases exhaust gas velocity, making sure each cylinder is completely evacuated to make room for the incoming charge. This design absorbs the sound waves without disturbing the power waves, in contrast to the chambered mufflers used by most aftermarket companies. Chambered mufflers use partitions or baffles to subdue sound waves, which also creates backpressure and reduces power.
The shape and diameter of the exhaust tubing is optimized for volume and exhaust gas velocity. Borla mandrel bends the stainless steel tubing for smooth bends and to make sure the pipe maintains its size and shape throughout the entire length. Tubes that aren’t mandrel bent can lose a percentage of their diameter in sharp bends.
Then you get to be the tuner. A block-off plate is positioned at the junction of the passenger side exhaust pipe and the entrance to the muffler. You can change the block-off plate to determine how much exhaust flow goes through the muffler and how much bypasses the muffler and goes straight out the passenger side pipe. With the solid plate all exhaust is directed through the muffler and out the driver exhaust pipe, for the quietest operation. Or use the plate with the largest hole so most of the exhaust exits from the passenger exhaust pipe, for the most exhaust flow and a more raucous exhaust note.
Borla® is the leading manufacturer of stainless steel performance exhaust products. The company began three decades ago making exhaust systems for concours classic Rolls Royce and Ferrari models, and gradually evolved to become the premier manufacturer of performance exhaust products for street, off-road and racing. Borla pioneered many improvements in the design of performance exhaust systems, holds several patents for innovative exhaust system technology, and has won numerous “Best New Product” awards. Today the company operates a state of the art research and development center in Oxnard, California, and makes all of its products at a world-class manufacturing facility in Johnson City, Tennessee.