I got on of those tips for my bike before i got my hmf pipe you might gain just a little bit of power, but all it really does is make it louder. Not as loud as a hmf. You might as well just get an hmf and be done with it.
Here is a pic of the one I bought off of Ebay, I like the sound it gives your stock exhaust, but the thing I dont like is that it backfires a lot if you are doing a lot of mudding to where you are shifting from forward to reverse a lot. But if you are running in the foward gears like trail riding and keeping the RPM's up it sounds good. The only thing i noticed is just more noise from the exhaust but have not noticed it running too lean or anything from the spark plug color.
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