Originally Posted by arok
there are ones from the 335i and it definitely makes a difference.
Well, I ran this "mod" for about two months and could not tell much difference. I put it back to stock and it seems that the valve is only closed for the first minute after a cold start. After that my valve is open all the time anyway so this mod makes no difference.
So like I said, this mod will not show up on a video camera very well IMO.
Exactly how does this mod on a 335i show up on camera when their exhaust is totally different then ours:iono: 335i's have dual exhaust systems. Do they even have these valves?
Anyways, it seems that this mod either varies on each car or each of us have very different levels of hearing