i just bought a mugen twin loop on ebay. it came off an em1(99-00 civic si coupe). my car is also an em1. the thing is, he had a full mugen exhaust system and he is just selling the axleback. i was wondering, i currently have an apexi worldsport 2 full cat. and if i take off my axleback, will that mugen axleback just fit right in? or will there be fabrication?