Right now I own a 2010 GT500 and have some mods but I'm not happy with the shifting problem and extra weight that the iron 5.4L has over the 5.0L... I want a efficient car and am leaning towards the 5.0L... What I need from you guys is what problems will I expect once over 650rwhp? I will have the hellion single 67mm precision turbo, 52lbs injectors, Kenne Bell BAP, SCT tuner, headers, h-pipe and catback... Also I was thing a twin disc clutch would go nice too... So let me know what you think and any advice... Blow By Racing has this setup on one of their customer's cars and at 15psi they made 653rwhp and 730lbs-tq... I know 15psi might be a bit much but I plan for forged internals in the future... I wanna run 10's and down the road 9's...