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cobb performance

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Hi everyone, I'm new.
Cobb is promising 50-60 hp gains and low to mid 14's ET with their stage3 power package. Has anyone here gone with that? Do you guys think it's credible? And also, is this way safer and more reliable than going with turbo?
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Ive got the street /turbo cams,,believe me you WILL love them.Makes the car even more fun to drive.
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