Fabspeed Motorsport

Fabspeed BMW Z4 M40i Sport Cat Downpipe (2019+)


The 2020 Z4 is BMW's latest incarnation of the Z4, keeping its reputation alive and well as a powerful and fun roadster. The Z4 M40i dramatically benefits, in terms of sports car sound and power, from a Fabspeed Motorsport Sport Cat Downpipe. You'll appreciate the more aggressive exhaust note and significant horsepower increase.These downpipes feature German made HJS 200 cell EURO 6 EC certified compliant trimetallic catalytic converters. We use 4 inch piping from the engine side to the cat, and 3 inch tubing from the cat to the rest of the exhaust. These are the largest and highest flowing catalytic converters you can fit on the M40i 3.0L. Larger catalytic converters are better because they allow for more exhaust flow and the increased catalysts surface area allows for better exhaust gas filtering which means emissions compliance and will OT trigger a check engine light. Our Sport Cat Downpipes are a direct bolt-on replacement for the factory Supra catalytic converter. When we looked at the factory 12” long 700 cell ceramic core cats we immediately found an opportunity for improvement. The OEM Cats restrict exhaust CFM flow, limit sound and worst of all, rob performance. Replacing the OEM cats for a set of Fabspeed Sport Catalytic converter will net you improved performance with absolutely zero fear of a check engine light.


Simple bolt-on installation. Instructions included below

The largest HJS tri-metallic catalytic converter that will fit in the factory location

This HJS catalytic converter will support 1200HP+

Designed to fit Left hand drive and Right hand drive cars worldwide

Significant performance gains across the RPM band. Estimated +35HP gained over the factory unit

Even more power can be unleashed with a ECU tune. Please inquire

No tune required

Superior quality all German and USA components built in house by hand

Optimized for maximum performance with NO catalyst generated check engine light, guaranteed

TIG welded by our expert welders

T304 stainless steel construction

Fabspeed performance products are backed by Fabspeed's Lifetime Warranty