Originally Posted by John_01
Congrats on your new sound! Can you please tell me the part number for the muffler you fitted. I understand yours (like mine) is a 2.5 litre engine, so I am wondering if the muffler may be different to the one for the 3.0 litre engine in the USA.
Hi John the part No. is 18 10 0 443 580 (for 330i) N52, N53 engines
Hope this will be helpful for you. The muffler has a valve in one of the pipes which, as far as I understood, is opened by exhausts of the 330i. This valve was left open in my 325i.
Pls see enclosed data sheet (from BMW Performance catalogue)