Exhaust

Dan the man said

I'll run long tube headers then. Couldn't I raise the front end up via the torsion bars

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Yes

Dan the man said

Is it true that 1 1/2" primary tube headers scavenge the combustion chamber faster than 1 5/8"?

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Totally dependent on a list of variables. In short, engine size and ability and power. OR Every last part dependent.