The mugen exhaust is overpriced. It is a clean exhaust but prolly not worth the money.

If you want something quiet on your gsr but that something that has a higher flow, get your self a OEM type-r exhaust system or go to a exhaust shop & have them make you a test pipe with a 2 1/2 inch exhaust to a dyno max muffler & a resignator sold at your local discount auto parts store.

This will give you more flow & better performance without sounding like ass

Good luck...