Tune and DP would be the Best start IMO. You will come in under1k and this will be your best performance bang for your buck since your going JB4 vs dinan. Exhaust would be next but you can blow your whole wad on an exhaust setup, depending on choice, for minimal performance gains but great sound gains.
Mike put together a great list and can hook you up.
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2022 M4 Comp X
2021 M440ix - Sold
2015 M235 - Sold
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