The ultimate catback exhaust system for the Ultimate Driving Machine includes Fabspeed's high performance Valvetronic rear muffler and exclusive "Double-X" midpipe for the perfect combination of sound and power.
Pure and simple, you're looking at the best-sounding M3/M4 exhaust system on the market. Don't just take our word for it, though...
"Fabspeed’s exhaust for the 2015 M3 and M4 might be the best sounding one yet" - AutoEvolution
"Fabspeed manages to make the BMW F80 M3 & F82 M4 S55 exhaust note not suck while gaining 20+ horses with their Valvetronic system" - BoostAddict
"Fabspeed's Valvetronic Exhaust improves the quality of the exhaust sound dramatically" - BoostAddict