http://www.erionracing.com/gsx-r600carbonfibersystem03-05.aspx

Anyone has or know about this bolt-on muffler?

Good? Not good? Please advise. Thanks.

Its pretty much the most generic carbon fiber bolt on you can get. Had two friends who had them. They sounded alright, nothing spectacular. They didn't do much for gains, but most bolt-ons don't. You can probably find something better for less to be honest, but if you can find a deal on it, it won't be a bad investment.

I got a deal for $215 with a K&N filter... is that a good deal?

Just picked one up for $90 I think it was well worth the money I spent on it...