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I have ran the GYT-R carbon muffler with the head pipe, and it works awesome. I have seen the dyno charts and the head pipe makes additional power from 7500 to the limiter, through that range it makes upwards of 2HP (progressive).
 

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I have a freind that works at Yamaha, and he lets me barrow/test his bikes. sometimes they have Aluminum, CF or Ti.
 

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i'm currently running the GYT-R carbon pipe on my machine. i dynoed it with the GYT header pipe and with the stock header pipe. and for my money i'll keep the stock header on. it makes more torque then the GYT-R header and only loses a couple ponies over 9000 rpm,but thats where the power drops off anyway. so to me the stock header is about as you're going to get. just get a slip on pipe and go from there.
heres a link to a previous post i put on here for my mods and a another link for a pic of the dyno results with those mods.

my yfz pics and dyno results thread
 
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