A stage 1 tune is the best bang for your buck. You can go from a stock 456hp to 570-590hp depending on tuner you buy from. $650 to $750.
Intakes and exhaust have only a mild effect (maybe another 20 to 25hp for a bunch of money...$2k+) Intercooler and turbos are even more $$$, invasive and potentially problematic if not done right by an experienced tuner.
If you goal is big numbers, get a 2020 with the larger turbos already. The 2020 on up make big numbers with a stage 1 tune. Amazing in fact.
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