[Nick54]

335i e92 the exhaust doesn't seem to be touching anything but it rattles on cold start and around 1100 rpm. when I hit the cats they rattle, but I'm wondering if it could be from somewhere else?

[Silent9n54]

every 335i rattles a bit on cold start, its the valve that opens up to heat up the cats

if u wanna get rid of cold start, get MHD and turn it off

[riczon.335i]

+1 mine always rattles at start up eventually goes away when I get all warmed up.

[Nick54]

Originally Posted by Silent11N54

every 335i rattles a bit on cold start, its the valve that opens up to heat up the cats

if u wanna get rid of cold start, get MHD and turn it off

sorry I wasn't clear enough that's when it's most noticeable but every time the revs drop I could hear it rattle.. it seems like it's coming from the secondary cats because when I hit around there with my hand it rattles slightly but it's not a clunking metal sound