Can you spin your tires w/ a A4 from a stop?
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Also, a tune might be just what the doctor ordered. Is it not true that a small amount of low end torque is lost through adding headers? So that combined with the fact that the LS engines offer less low end than the former LT1s did, and the fact that you are 273s could be the reason maybe.
lots of good reading material:
https://ls1tech.com/forums/new-ls1-o...questions.html

