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No worries on the driveline as it’s mostly M5 parts and very overbuilt. S58 is totally forged so as long as your octane matches the tune, no issues there with a “moderate” boost increase.
As fast as these things are stock, I’m betting their X4M Standard Non Comp measured 540-550 engine hp stock. Then they added a safe 60ish.
This will make an awesome ride.......uhhhhh....awesomerrrrrrr
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