Soldato
- Joined
- 14 Jul 2005
- Posts
- 17,616
- Location
- Bristol
A ned, are you Scottish? 
Mine was never actually that loud and it had failed open (not sure what happened there, no golf T or anything) so I'm surprised yours is loud enough to worry about upsetting people. Unless of course you've got failed baffles etc. but the setup inside the 328i rear silencer is hilariously complicated (it does about 3 loops of the box through baffles) which quietens it down loads.
At low revs it shouldn't be that noisy really anyway as you don't have the revs for resonating, the unsociable noise should only come at mid-high revs which is when the valve would normally be open anyway.
My 328 was very quiet around town unless I was being a chav and using the revs loads, unlike the 325 which is just hideously noisy all of the time due to minimal baffles, no cat etc.

Mine was never actually that loud and it had failed open (not sure what happened there, no golf T or anything) so I'm surprised yours is loud enough to worry about upsetting people. Unless of course you've got failed baffles etc. but the setup inside the 328i rear silencer is hilariously complicated (it does about 3 loops of the box through baffles) which quietens it down loads.
At low revs it shouldn't be that noisy really anyway as you don't have the revs for resonating, the unsociable noise should only come at mid-high revs which is when the valve would normally be open anyway.
My 328 was very quiet around town unless I was being a chav and using the revs loads, unlike the 325 which is just hideously noisy all of the time due to minimal baffles, no cat etc.