Stainless steel exhaust system 1 × 90 mm for Toyota Supra 4 — TA Technix

A complete exhaust system replaces everything after the catalytic converter. Its main effect is sound: less restrictive mufflers, a deeper tone and a sharper-sounding rev range. In terms of power, the gain exists but remains modest on a stock engine, because the main restriction on a production engine is upstream - the catalytic converter and downpipe.

The second effect, less heavily marketed but more durable: weight and durability. A stainless steel exhaust does not rust, can still be removed ten years from now, and weighs less than the original aluminized-steel exhaust. On a car you plan to keep, it is the part you only install once.