Maybe 30HP before tuning. Just a guess though.
I don't think that those are enough to get you to 13 flat. You may want a tune and stickier tire... Are you in a 6 speed or 7? If you're in a manual and you have stickier tire, you can power shift 1st through 4th and shave a tenth off.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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