I own a Cayenne Turbo S ( standard for now) and my m8 (he is on this forum) has a 335i with jb3. His car is quite a bit quicker than mine
30 to 70mph 0.5 of a second quicker.
60 to 100, nearly 1 second quicker.
Although mine was not going right. I had a knackered maf and 1 leaking dump valve. Both mafs & DV's replaced now, I would say his car will still be quicker by around 0.3 and 0.8 of a second. Still a big gap. Mine will be getting remapped soon wil be interesting to see the difference that makes. I Prob still get beat, his car is very fast
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540i
GTR-R35, F90 M5, X3MC, RS3, RS7, M5, S7, S3, RS3, RS6, GTR R35, 996 Turbo, M5, RS6 V10, Cayenne Turbo S