Borla Exhaust System: AUDI S4 TWIN TURBO V6 AWD 1999-01.
BORLA exhausts are built of aircraft-quality T-304 stainless steel -- stainless inside and out.
Borla's free-flow exhaust utilizes patented award and race winning technology to deliver quality, sound, performance gains and enhanced fuel economy — all with an easy bolt-on installation. All BORLA street products carry an unsurpassed written million-mile warranty. Gains are usually 7-10% increase in HP. Applications: | 
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