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Old 10-07-2011, 11:38 AM   #4
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Join Date: Aug 2003
Location: Greece/Chios
Posts: 1,040
My Ride: M3 E46 6MT 3/2005
Originally Posted by Dan330Ci~ View Post
Hi, I have a RHD UK 330. It does have 4 cats total and produces 231hp.

The RHD headers are different to the LHD design, I consider them less 'pinched' where the 3 ports join to 1 before they go into the cat. If you look at the LHD headers you will see what I mean. However the RHD headers head upwards and towards the front of the car before doubling back so it's probably even.

Considering your car is LHD you have many aftermarket options available, remember that the RHD headers DO NOT have all the bolts drilled for studs. If you look at the flanges in the link you posted you will see there are gaps in the stud pattern. This means you will have to put those studs there (i.e. drill and tap the holes) or use a header that has joined-up flanges.

I'll try to answer more questions later
Thank you for your time and reply mate..
I know what you mean about the difference between LHD and RHD oem headers..
If i understand correctly.. Are you talking about the holes for the bolts that are on the flanges..?? I can see from that the RHD headers have 8+8 holes and that the LHD headers have 12+12!!
Very useful detail info!! Thanks mate!! Although iam gonna deal with the front section/catal.converters right now and do headers & cats later (maybe in the winter)...
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