For the S4 enthusiast desiring a deep, sportscar growl with enhanced throttle response and power output, we highly recommend the Borla cat-back exhaust system. Now available with dual 3" rolled edge tips on a single inlet/dual outlet rear muffler, this system cannot be beat in terms of looks, sound, and performance.

Dyno testing has shown an average 7 crank hp improvement using this system, due to its big 3" pipe diameter and low restriction, straight shot mufflers. The S4 Borla system is full stainless steel and comes complete with all installation hardware and Borla's famous Million Mile Warranty!

The stock exhaust piping measures 2.5" in diameter, whereas the Borla uses true 3" piping and 3" inlet/outlet mufflers. That's nearly a 32% increase in cross sectional area. No wonder this system really lets the boosted 2.7 biturbo motor breathe easy.

All Borla products are made to order. Please allow 1-2 weeks prior to shipment.

About Manufacturer: Borla
BORLA is committed to providing world-class exhaust products which surpass the expectations of our customers. To that end, our facility is complete with a state-of-the art test and development center where we are continually improving our manufacturing efficiency and standards. We have pioneered a variety of improvements in the design of performance exhaust systems. Alex Borla currently holds several US patents for innovative exhaust system technology, and the company has won numerous "Best New Product" awards in the industry. Every BORLA Cat-Back™ system, Header and Rear Section is made from austenitic stainless steel (superior to 409 or aluminized steel) employing mandrel-bent tubing, all-welded construction, and is designed for accurate fit and easy installation. Nearly 30 years experience and special merge collector technology provide the ultimate in power and endurance.