i used to shift my monte carlo ss 200r4 and i would get like a couple tenths better sometimes but might just have been launching better the only time i like shifting it myself really is when your doin a rolling start. if u do a like 15 roll or somthin and keep it in 1st man does it throw u back harder than letting it downshift, im sure it wasnt good but i was a stupid 17yo and now i like manuals so i can do it all i want lol
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