you dont absolutely have to send it in. I did the viper exhaust mod that was marthy's idea for around a total of 275ish (without the PCV). It's much louder compared to the stock and i would never go back. On the stock i couldn't hear my buddy driving it when he was 100 feet away. I can hear the viper exhaust from a good half to full mile if you listen carefully.. and If you get the PCV it will add around 2-4 hp...Well its one im most interested in. The thing with marty is sending my exhaust in. How loud or the marty exhaust and how much hp does it add on
ask 99Venger. He got a nice 2 bro with JB for sale... good deal.will an 06 r6 header work for the mod?