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Congrats on this build! It's going to be insane!! If I could add one piece of advice from my recent experience with my L99 TT - skip the shorty headers. You don't need to spend the money on them and they won't gain you any power. I had Kooks long tubes before my tt and we took them out for the install and are now using the stock manifolds. They move plenty of air, trust me!! My car dyno'd 545rwhp at 7psi with the Hellion kit.
PM me if you have any questions, I'm not an expert but would love to assist in any way I can. Thanks,
Adam
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