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topspeed

  1. 1st Gen - Engine, ...
    So I've got a Topspeed Header and a Fujita F5 intake on my car. The previous owner put the Topspeed header on, so it wasn't my choice haha. It "hisses" under acceleration, and I've read this header has this problem. What causes this sound? The flex pipe? Is the flex pipe the same as a test...
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