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Does anyone know(couldn't find on the wiki) the inlet/outlets of the cats and outlet of the headers?

I wanted to start piecing together a Y-pipe and Test Pipe system, but I wanted to make sure I had the right pipe sizes.

I'm sure there's some logic to this, but it's eluding me at the moment :)
 

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most of your test pipes will be from 2.25" to 2.5" and your y-pipes are going to be 2.5" inlets with a 3" outlet... your stock midpipe is 2.5".. this will cause a little rasp but it's not terrible IMO... the Nismo y-pipe has a 2.75" outlet i believe and I think the Tanabe Y pipe is stock sized with a 2.5" outlet... good luck with your search and the wiki is always a good place to find some info as most y-pipes should list the inlets and outlets
 
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