i have a 96 civic coupe. im going to be putting in an LS motor and then later go ls/vtec... i have a 5zigen cat back exhaust for a coupe... i was seeing if i could use these mugen copied header http://www.jprmotorinc.com/pro...d=308 with an itr cat http://hmotorsonline.com/shop/...D=200 with the catback exhaust? would this work or should i just get a test pipe?