Stock ones with TP's vs LTH's, I would say at most the difference is 10whp but that's with tuning. Typical is closer to 5-7whp. But one thing you can't beat with long tube headers is the glorious sound that trumpets out of your exhaust. It's a symphony of awesomeness.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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