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I have a 2004 ls1 pro charge gto with íntake, exhaust, blow off valve is running 450 to 480hp but my goal is to hit 650hp what stuff do I gotta put and am I gonna blow my engine out and how much do you think is gonna cost me to do the upgrades
 

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Dont need anything but enough fuel and to spin the blower more. Which unit is it? Id swap the innercoler and bov if its the basic stuff. Tiny blower pulley and send it. Could spend money if you want else where but people will tell you not to, head wise. Did 680 on 14#'s with a large overlap cam.
 

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Properly tuned, they will handle plenty of power. 650 shouldn't be a problem.
 

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200 shot of nitrous.
 

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My advice, find a reputable shop and pay a pro to do it for you.
 

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Not sure what head unit you have. But I recommend D1 or F1A, Alky control system, and lonnies full return fuel system. Then get a good tune. At those powers I recommend looking into adjustable suspension to keep the power to the ground. Good luck.
 
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