UPDATE!!!!
Hi guys I have an issue and hope some of you might be able to help.
I placed an order on 18100443580 with bmwminiparts.
The great guys there notified me of something that could have potentially caused me a lot of grief.
They mentioned the following:
18 10 0 443 580 SILENCER
TECHNICAL
FOR E9X N52 ECE CARS BUILT BEFORE 06/06
IT MAY BE NECESSARY, WHEN RETROFITTING
THE PERFORMANCE SILENCER SYSTEM, TO
INSTALL THE MIDDLE SILENCER SERIES
SPARE PART AS WELL DUE TO THE DIFFERENT
PIPE DIAMETERS PART NUMBER IS 18.30.7.566.932
So I went and had a look underneath my car (near the muffler) and unfortunately it doesn't look like what John01 posted. For my car - E90 build date 04/06 there is a CAT Converter in that spot - Very similar to US Spec as shown in this thread:
http://www.e90post.com/forums/showthread.php?t=301917
I spoke to my BMW mechanic and found out the after around late 2006/2007 BMW slightly changed their exhaust and put the CAT converters very close to the front of the car.
So at the moment I need to go underneath my car and measure the diameter of the end of my exhaust pipe (before the muffler) to make sure its 63.5mm
bmwminiparts came back to me and said that a BMW PE exhaust doesn't exist for 325i.
If any one has any information on this it would be greatly appreciated.
Cheers!