I recall reading about a UUC exhaust designed to eliminate raspiness. I think they blamed the sound on VANOS. I wasn't aware that it was an issue with the non-VANOS DOHC motors. My first BMW was a '72 Bavaria. . .SOHC M30 with minimal exhaust. . .no cat. . .twin downpipes into a common resonator then single pipe to a muffler. Sounded pretty sweet! My DOHC M42 with a BroSpeed cat-back(no resonator) sounds about as raspy as that M30 did. Not bad for a 4-banger, IMO, but not as sweet as the six. The M30 in my E28 was quiet, but that had a full-length twin exhaust with cat + resonator. What kind of exhaust is on your Ti? |