I am considering buying a Mugen twin loop exhaust system w/ the JDM cat. My question is will the exhaust system bolt up directly after i purchase a JDM 4-1 header? Will there be any fitment issues that I need to worry about? Thanks for your help.

 

It will bolt up. The only problem you will run into is that there is no bung for the secondary o2 sensor.

 

Aren't there 2 different Mugen exhausts? One for USDM and one for JDM?

My Mugen TL exhaust had a 2.25" pipe from cat to resonator...