I think i am gunna go with the fmf powercore 4 slip on and eventually get a head pipe after i get some money or i will go for a white brothers e-series exuast slip on. I cant decide. Do any of u got any suggestions or any other pipe recommendations? I like the tuneable exaust but it might be a pain. The powercore gives power and more torque through out the entire power curve...the e-series is adjustible... it is a little more expensive though. any other pipe recommendations?