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I just recently bought a '05 GSXR-1000K5. It already had the aftermarket exaust "Yosh TRS" slip on. (I wanted the black/red and this place was the only one around that did not want to overcharge me for it the exaust only cost an extra 300 and no installation fee because they did not want to take it off and it is the carbon so not a bad deal) I was wondering if I am sacrificing any preformance or not. I have gotten many different answers. The most frequent was that I will lose some low end because of the extra fuel need because of the lower back pressure but gain a bit on the high end because of the increased flow. I just dont know that much about this. I am a newbe when it come to this stuff.