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The 1st thing I would do if i were you is solve your 60ft problem. Mickey Thompson ET streets will hold much better, but I'd bet your not doing a good enough burnout process. Do you pull far enough out of the water box when you start your burnout? You also need to get some data logs on your passes! Your engine could be hot as hell during your run. What is the DA where your at? There are a whole lot of factors that you need to look at. If you are at 5000ft elevation that would partly explain your mph being so low. Tune could need some adjustments. Nothing against Pat G bc I've heard nothing but good stuff about him. But a dyno won't tell you everything that's going on down a 1/4 mile run.
You've got good parts on it, so your car should murder those times! Spinning is the first issue I would address.
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