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Can't speak for the 50i, but my 40i spools faster/louder and pulls hard. Although, I also have a tune and the M performance exhaust.
I had catless dps on my N54 335i and it was day and night.
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2022 M Sport G05
Jb4, CTS catless dp, M performance exhaust, bms intake, IND goodies, Maxton kit
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