BMW G80 G82 M3 M4 S58 Competition Stainless Steel Decat Downpipes with Flexi

The TIG welded M3 M4 downpipes are made of T-304 high-grade stainless steel.

Due to the turbo’s faster spool, it has a sharper throttle response, as well as substantial power improvements and a much more aggressive exhaust tune that sounds incredible. These downpipes have a flexi in them to make installation easier and reduce exhaust under stress.

The easing of the turbocharger results in lower temperatures and reduced exhaust backpressure.

The cylinder charge is raised as a result a higher performance is achievable.

There is a significant weight reduction due to the redesign of catalytic converter from stock.

Mandrel has been bent for better gas flow and maximum internal dimensions to provide best performance without losing mid-range torque.

Brushed stainless steel finish

We tested this item and discovered a 15-20bhp increase.