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my bad, I forget it was the 1g automatic Tsi that had the 390cc's. But do you think i would have to go as high as 660cc. I have heard that 550cc idle pretty rough, but all i ahve for mods now are brode uic pipe, 1g bov, t3/t4 (not installed yet) starion ic (not installed), 255hp wallbro, joe p manual boost controller, k&n cone filter, cut the dump tube, boost gauge (that is all I can think of). i have read that people have ran 11's with 550's no problem.
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