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It sounds too good to be true. The numbers he claims seems to be high. You would think if his numbers were that good he would have dyno'd it and would be selling like crazy. I really don't believe that just by going to a 2 1/4" will yield you that kind of power, it may but would it be at a use able RPM range? etc... Also keep in mind many rice rockets tried enlarging their exhaust system and most actually end up loosing power and just end up with and obnoxious sound.
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