Quick question:

I'm doing a very mild build on a b16 (cams / im / tb). I'm after the JDM ITR header to complete the build, however as we all know it has the 2.5" collector. I have an APexi WS2 Exhaust (60mm / 2.36"). I REALLY like the exhaust and don't want to swap it out for a true 2.5". So the question is, is it worth it to use a the JDM ITR header / 2.5" high flow bolted to the 2.36" exhaust OR will the bottleneck that creates basically cancel out any gains from the ITR header?

Thanks

 

bump. Will going from a 2.5" header / cat to a 2.36" exhaust defeat the purpose of the upgrade in the first place?

 

you will be just fine, it's such a small difference in size.

also what header donut gasket are you using?