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I think a couple guys have gotten around 500 WHP on the stock turbo but using an E85 blend. Maybe 450-ish WHP on non ethanol gas? I would recommend a new HPFP, downpipe, and in my opinion I would leave the stock airbox in with a new drop in filter. I had the MST intake for a few hundred miles and all it did was make more noise and I experienced higher intake air temps.
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2024 M2
2019 M240i- Sold
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