Externally gated gt2871r tial 44mm tune

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So, I have an sr tuned on a gt2871r on 16psi making 300 Ish hp, I wanna go externally gated and now have a modded manifold and tial 44mm external waste gate. I haven't installed it yet, but I was wondering if I installed my external wastegate if it would screw with the tune, I just don't want it to lean out and explode, my tuner won't be back in the country for another 2 weeks and I have a drift event I wanna hit. Should I be alright? Cause my stock manifold is cracked and not holding boost, which is why I'm switching to the new manifold. Help would be greatly appreciated.