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If you have an LS3 (manual), you really don't need a tune with those mods. If you have an L99 (auto), there is a benefit to getting one now (AFM disable, 93 octane, shift point improvements, etc.) but not because of your mods.
You might want to think about what your goals are for your car long term and work from there. For example, a lot of people get long tube headers with cats as one of their "foundation" mods.
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Performance Mods:
Kooks 1-7/8 LTs; Calico coated w/HFCs, Solo Mach XL catback w/J-pipes, VMax TB, C.A.I. Intake, JRE Tune, RX Catch-Can
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