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Originally Posted by ImprezaRSX
so what's a throttle body bypass? Is that something like an air filter bypass? or cross drilled brake lines and blinker fluid?
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No, its an actual thing. You bypass the coolant that runs through the brake lines since the coolant that runs through there is hot. It has dynoed between 6 and 10 rwhp difference in LT1's which isn't too bad for a free mod