Ok so I just got off the phone with National speed and they are only getting 410whp. They fixed the belt slipping and still getting the same results. They sent the tune to uprev and they are saying it may be the test pipes causing the car to lose boost. We are doing to go back with the cats to see if we can get a little bit more HP. As always I will keep you informed. Stay tuned for dyno charts.
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Stillen Exhaust, Stillen Supercharger, Stillen Oil cooler, Stillen Headers, Test pipes, 928 Impeller, 9 lbs pulley running 12lbs of boost, Custom tune from National Speed. 415WHP 345TQ
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