A new exhaust system can improve emissions if the original catalytic converter is degraded or damaged. High-flow catalytic converters maintain emission compliance while improving performance. However, the exhaust pipe itself doesn’t reduce emissions – only the catalytic converter and emission control components affect pollutant levels. Replacement costs £200-800 depending on specifications.
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Will a new exhaust improve emissions?
Will an aftermarket exhaust pass emissions?
Aftermarket exhausts pass emissions if they include CARB-approved catalytic converters and maintain proper air-fuel ratios. Cat-back systems (after catalytic converter) don’t affect emissions but headers without cats will fail testing. Choose systems with 50-state legal certification. Quality aftermarket catalysts can match or exceed OEM performance while providing enhanced sound and appearance.