Thread: 1960 GMC K1000 4x4
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Old 07-18-2012, 05:58 PM   #71
KroAutomotiveInc
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Re: 1960 GMC K1000 4x4
Quote:
Originally Posted by McMurphy View Post
they are so you can run basically straight headers and bypass your mufflers which rob you of horsepower.

the robing of horse power is it just from the loss of back pressure?
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