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Take it back and try again. You should be able to pull off 15's easy. I've seen several 2.4 SS/NA cobalts run 15's and high 14's with mild mods. A few had a free flow exhaust, CAI, stronger motor/tranny mounts and ran with 16" slicks on the front to improve the axle ratio. If you are going to run at the track and have 17-19" rims, pull em off the front, drop down to 15-16" rims and you'll get a much improved time.
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