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and the mods you have made so far. Especially if you improve the exhaust with some with down pipes and at least Cat back. Best to put larger mid-pipes as well if the budget will allow it. I have the GT525's and show 460WHP on the SZ dyno, Seb advised me I am loosing 60+hp due to stock mid-pipes & Cats. On a dyno a good tuner can a establish a balance between boost and timing to keep you detonation free on 91.
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