Valvetronic BMW M8 Valved Sport Exhaust System (F91,F92,F93)*Orders on a rolling pre order basis!* At Valvetronic Designs, we have developed a valved system for the M8 that will put a smile on your face no matter the occasion. Constructed out of Our Signature Titanium, the M8 system measures 3 inches from inlet to outlet. This system utilizes a large cross section x pipe for the most exhaust scavenging possible. The system runs back to electronically controlled exhaust valves that can either be tied into the