Hi guys,

I have just purchased a 2009 BMW 135i N54 and want to mod her for more power.

I have sourced a performance intercooler, but cannot for the life of me locate a N54 performance cat from a UK dealer! (I don't want a cat less pipe, cos of the MOT).

Has anyone else have these issues, or will the N55 fit the N54?

cheers

Morning Nick

Welcome to the Forum

Have you checked www.realoem.com it is a BMW online parts list find your model and year then cross reference against the part numbers for your cat against the 140m model or even 240m models. Dealers have enforced tunnel vision and will never consider swaps like this .

When I owned Volvo T5's an ECU remap would get to around 300hp but if a 200 cell cat with 3" down pipe were part of the change 350+ was easily achieved (fast dog movers)

So I would also check out some of the after market sports cat suppliers 2 that I used with the Volvo's were Remus and Scorpion, Remus are expensive Scorpion were always more affordable and I though a better sound.

Good Luck

Dave

Thanks Dave, I have opted for a downpipe. I know this is more hassle for the MOT time. But, after extensive research, this seems the more 'fun' option.