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My suggestion would be to look at what some of the experienced tuner shops have done because they have sorted out what works and what doesn't work. Most have a few levels of mods- like 50 hp, 100 hp, then 150 hp for example.
Just compare prices and hp gains and your particular needs/wants.
And everything needs a tune to go with it so keep that in mind.
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LS3 intake and throttle body, Huron Speed Products twin turbo with 6265 oil less turbos, and 3" header back, JRE smooth cam, ID1300, Fore dual 450lph pumps with MSD voltage booster, A6, 305/45/17 MT Street R
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