I used to, but i've tested my 0-60 with my superchips, using standard Drive, and shifting on my own. I ran my fastest time by just using regular drive, not shifting. That being said, if i'm just messin around and i have it in first gear at about 4k rpm and punch it to 5k it jumps really hard. It can't be good for the transmission, but i don't do it often. I actually did it at night with my headlights on once and the car going in the opposite direction flashed their highbeams at me. I think whenthe front end jumped they thought i flashed them.
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