if you want top quaility, look at Mugen twin loop, about 600 or so for the rear section at inlinefour and you could probally get it cheaper through ALLJDM.com Also apexi WS has been getting good reviews (or is that the super loud apexi?) If you have a decent exhaust set up now and it is just too loud, go to a good muffler shop and ask them to see if they can put a resonator on it. A glasspacked one will cut down on flow rate a little bit but it will make it much quieter.