Obviously the ultimate answer to this question is to get a tuned exhaust. As of no the funds are not available and the stock can does just fine... Except the coupler, the supplied silicone coupler lasted through break in, and now I have been using 5/8" automotive heater hose. Which only lasts a couple tanks and then breaks. So, asidesn from buying a tuned exhaust, what else is out there that will last a little longer than 2 tanks?