We just received a stock nismo h-pipe and midpipe thanks to a forum member, dmhenderson
We should be making some solid progress from here. I just did a rough measurement of the stocker and I was a bit surprised at how small the stock exhaust is!
the inlet of the stock nismo H pipe is about 2 1/4" and the outlet where it meets the midpipe is about 2 1/8", same with the inlet of the midpipe, after the resonators the piping gets slightly larger again to 2 1/4" so the outlet of the midpipe meeting the rear section is about 2 1/4"
Not sure why the piping changes sizes but I can definitely see Nismo guys upgrading their h-pipe/midpipe to a full 2.5" dumping out to their stock rear section for some good increase in sound and performance
stay tuned..
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