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The tuner in my area that did R&D for the Hellion single turbo made 497 rhp and 511 rwtq on two bone stock test mules through factory cats at 10psi. They raved about the kit and it's quality.
I'm still waiting for the finish, but the one before me made 450 whp 470 rwt at 5000 feet. All bone stock. I'll get some pics up later today as long as they finish it.