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Re: Peanut sized Y-pipe ???
it all comes down to back pressure. more back pressure is good for low end torque and less is good for top end power.
how its measured i have no idea.
98 GMC Serria K1500 350 auto, SC, SWB, FS,
91 GMC Serria K1500 454 5 speed, SC, SWB, SS, SAS
project '57 
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