Mixing And Matching

[rtune]

Can you mix dump pipes, down pipes, cats and cat-back exhausts that

are all BNR34?

For example, mines or tomei dumps, midori down pipe, a sports cat from somewhere else, and

a trust catback exhaust?

Are they all made to flange up at the same places leaving you just to worry about diameter matching?

[NYTSKY]

As long as all the flanges and diameters are the same, i dont see a problem.

[XKLABA]

Provided they are all "bolt on " it want be a problem, I have CES dumps and fronts, metal cat and HKS catback

[rtune]

Ok that's good.

So then I have a slightly different question.

How can anyone consider a bolt-on 90mm exhaust or downpipe if all the hi-flow bolt-on cats I can see (sard, apexi, mines) are 80mm in and 80mm out?