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A lot has to do with how you shift.
It you power shift and drag race a lot, you're on burrowed time even with a stock engine.
375/425 hp range is very conservative with any blower on a GT and the tranny can handle that.
Once you get close to the 500hp mark, you need to behave. lol.
seems like a waste to me....there is a ton more potential there. Get something that can do upto 10lbs and still run a conservative tune would be a better idea