Front center muffler in EVOG2A-xx stainless steel exhaust system — TA Technix

A complete exhaust system replaces everything downstream of the catalytic converter. Its main effect is sound: less-restricted silencers, a deeper tone and a more noticeable rise in revs to the ear. In terms of power, the gain exists but remains modest on a stock engine, because the restriction in a standard engine is mainly upstream - the catalytic converter and downpipe.

The second effect, less often mentioned but more lasting: weight and durability. A stainless steel exhaust system does not rust, can still be removed in ten years and weighs less than an original aluminized-steel exhaust. On a car you intend to keep, it is the part you only install once.