trying to think if this setup will work or will i need a custom setup? i'm thinking of picking up a T1r racing convertor will it be a direct bolt on for jdm header and usdm ITR b-pipe?

 

I will be running a JDM replica header(2.5in collector) with a 2.5in cat bolted to my stock exhaust(until my T1R catback arrives) and the shop that's installing it for me said it will bolt up fine. Hope this helps.

 

Make sure you get the correct cat or test pipe length. Other than that, it should bolt up just fine.