ok im running a SE103 w/255 cams, decatted header, 4" SE mufflers, SE ventilator and a SE pro super tuner. my question is how much of a power gain would i get from switching from my decatted header pipe to some brand of " true duels" ?

 

I'm not a mechanical guy but my guess would be nothing at all that you could notice from physically riding it. I'll bet it would be a lot louder to the point of you wished you didn't like me haha.