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Yoshimura rs4

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I just bought a brand new 2011 yz250f and was thinking about a yoshimura rs4 titanium/titanium, my friends said that the sound will not change but if the motor is lacking some thing it may help... I do like thew sound of my bike but I feel it lacks top end.. any opions would be great

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the yoshimura pipe adds half a horse power. and yes it is louder. the stock pipe is pretty good and i would get a dr.d, gytr or fmf. yoshi website admits to only half an horse. shows a dyno and has less bottom. dr.d gives more top. i would go with dr.d

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