I'm in the process of geting the JDM 4-1 header. However, I like keeping the car looking and sounding stock.
Now is the JDM ITR muffler the exact same as the USDM ITR muffler?
I was planning to get the JDM ITR bpipe (is this 2.5" thru?) and wondering if it will bolt right up to a USDM ITR muffler?
I know the bpipe has to be shortened (since the JDM cat is shorter)... unless I can find an aftermarket 2.5" high flow cat that is shorter than the stock USDM cat?

 

I believe the ITR B pipe is a 2.5 collector that dwindles to 2.25 back.