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I have an M2 comp with the m4cs tune. And a stock x3 m40 2020 with the b58tu. The b58 has more torque below 2500 rpm and feels less laggy at low revs. But it's not as aggressive as the s55 in the midrange and the s55 with the CS tune has a monstrous midrange. But the b58tu is very, very impressive. It's probably the best engine I've experienced. Incredibly smooth, near instant torque, free revving, and pulls very well at all rpm's for a turbo engine.
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