Motordyne measured the power loss of the HFC to the resonators at 2-3 whp. I haven't seen the dyno differences. I would measure the diff with mine but superharging changes things. The HFC is notably more expensive like Syno said. Well you have the option to DIY or BUY
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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