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  1. 6pktgo

    HP Manifolds vs TTI Headers ?

    1970 440 SIx Pack, nothing to crazy, on the dyno at 5500 rpm making 425 hp & 530 ft lbs of torque. I've always run original HP manifolds & factory H pipe, full exhaust. Is it worth it to install TTI headers ? Will it boost the horse power & if so by how much roughly ? Thanks in advance.
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