Fabspeed BMW B58N Sport Catalytic Converter Downpipe (2023+) - FS.BMW.B58N.SC Fabspeed Porsche 992 GT3 / GT3 RS Valves closed tone is increased

Valves closed tone is increased moderately while still comfortable with factory center muffler in place

Retaining the stock side mufflers and valves allows you to control the sound with the factory sport button

Fits all BMW E46 M3 vehicles (2000-2006)

We based our custom McLaren downpipes around 3

Now more than ever the most inexpensive mod on sound you can perform on a GT car is eliminating the factory valves and/or overriding the valve control

Fabspeed BMW B58N Sport Catalytic Converter Downpipe (2023+) - FS.BMW.B58N.SC Fabspeed Porsche 992 GT3 / GT3 RS Valves closed tone is increasedThis downpipe feature German made HJS 200 cell EURO 6 compliant trimetallic catalytic converters. We use 4 in piping from the engine side to the cat, and 3 in tubing from the cat to the rest of the exhaust. Our 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 that will NOT trigger a check engine light. Our