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The reason it is a thing on a stock Gen 2 is because Gen 2 stock valve springs are 20 pounds . . .
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Turbo Busa
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RedBull
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Rojo
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Boosted Gen1 & Bolt on Gen2 vs Gen3 thru Factory mufflers * | Dyno Kings
https://www.hayabusa.org/forum/threads/rocketman-build.200405/
bolts 2011 Gen2 *
