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Anyone know the difference in power gain number wise from slip on to complete exhaust system. Any brand is good but I'm most interested in some HMF numbers. Thanks.
 

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I'd be interested in seeing some HARD DATA. It's hard for me to believe that the difference between the stock header and an aftermarket header is substantial. The huge bottleneck in exhaust flow is in the muffler, that is supremely obvious just by looking at the p-shooter, then when you pull the spark arrestor and see how messed up that design is and then add to that seeing the wall down behind the spark arrestor it's amazing the bike even runs at all.

Not saying aftermarket headers won't help but on every 4-stroke I've owned going to an aftermarket muffler made a HUGE difference.
 

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I was told that an aftermarket headpipe was not needed untill you start making internal mods.....hopfully Sparky YFZ or another builder can chime in on this cause it a good question.
 
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