If so then the mugen twin loop is about the best. I dont know about the mugen exos system unfortunately sorry.
Jasma is not a brand, it is a quality stamp given in Japan to parts to prove their quality!
I used to have a full catback Tanabe exhaust system and it was good but now I have changed to a custom 2.5" system with an Apexi N1 back box and the custom system is way better! gives much better flow, its lighter, sounds better and its cheaper!