Stainless steel exhaust system 2 × 80 mm for Audi 80/B4 S2/RS2 sedan + Avant type B4 — TA Technix

A complete exhaust system replaces everything after the catalytic converter. Its main effect is acoustic: less restrictive mufflers, a more pronounced low tone, and a crisper-sounding rise in revs. As for power, the gain is modest on a stock engine because the main restriction on a standard engine is upstream - in the catalytic converter and downpipe.

The second effect, less often highlighted and more lasting, concerns weight and durability. Stainless steel does not rust, can still be removed ten years from now, and weighs less than an original aluminized-steel exhaust. On a car you plan to keep, it is the part you only install once.