With LTH's, pressure drops and you lose some boost. Solution is to buy a smaller pulley to increase boost. With the headers and smaller pulley pushing the same psi as the stock Stillen kit, it will create more power. PSI to PSI, the headers will create more power on nearly every supercharged application than without... Unless the unit is undersized.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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