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Thanks for the rapid response.... I am between a 6768 DBB and a Billet HP4271RL. The PT Billet 6765 in the Supra world is making from 800 to 850 WHP on a manual 6 speed equip car on E85 and gas application between 30 and 35 PSI of boost. My transmission is a big 4L80E and I need 750 WHP...

Patrick a few question for you sir .... To bad we don't have you in the Supra community to help us out with question on Precision turbo performance and specs. I really enjoy all of your post here in turbobuick. What is the difference in HP and spool between the Billet 71HPQ, Billet 71HPS...