Hi all,
Soon to take delivery of a Spoon B-Pipe and Spoon N1 exhaust for my EM1.
I'm also grabbing a 5Zigen header from a trader off these forums.
My question is - I need a high flow Cat - what size do I get to fit this header and b-pipe as they are both 60.5mm?
Xforce High flow cats are either 2.25" or 2.5" - this equals 57.15mm or 63.5mm.
Now I know with the Xforce high flow cat you need an exhaust shop to weld the flanges on each end but do I go a bit smaller or a bit larger? It's about 3mm out either way so I need to find out which one I should get - exhaust experts, I need your help!!
Waggy
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