Fabspeed BMW Z4 M40i Sport Cat Downpipe (2019+)

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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 NOT 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. 

FEATURES: 

• 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

Why We Choose HJS Catalytic Converters: 

HJS German imported catalytic converters are made from some of the highest grade materials you can find in a catalytic converter. This yields high performance gains and longevity so it wont deteriorate over time like lower grade catalytic converters. These catalytic converters flow up to 93-95% of a straight pipe in most applications. The benefit is that you get the "straight pipe sound" while still being able to provide enough emissions scrubbing to prevent a check engine light.    If you'd like to learn more, watch our video about HJS catalytic converters.

Sport Catalytic Converter (STREET) - This product removes the OEM catalytic converters from the vehicle, and as such, is strictly intended for closed track events and off-road use only. This product contains a High-Flow Sport Catalytic Converter solely intended for track and race cars as it is NOT California Air Resources Board Certified and not EPA certified. You are hereby informed and warned to check your local, state, and federals laws before buying and installing these or any aftermarket parts to be sure whether usage is in violation. All installation-risk and use-risk is borne by the end-user and installer of these parts.