Smart Car Conversion Kits

Exhaust upgrades for the Smart Fortwo 451 (2008–2015). Shop the rear center dual cat-back exhaust system and the Smart Fortwo performance exhaust system, both made for the 451 platform.

A cat-back system replaces the exhaust from the catalytic converter back, so it changes the look and sound of the rear of the car. Check each product page for exact fitment and what is included. Want the background first? Read our post on the benefits of performance exhaust systems for Smart cars.