My 335i pulled 0-60 off in high 4's stock, but not mid 4's. However, I never tried lauching in 2nd gear until I had a tune and downpipes. The HP/TQ numbers are a bit underrated for the BMW too by the way.
My highly modified SRT6 would pull a 3.9 only after these mods on street tires, which probably costs around 6K.
- Stacked pulleys
- NW sheet metal intake manifolds
- Wavetrac
- Rear-end gear swap with TCU
- NW single
- Fuel mods galore to support the boost
My 335i has run 3.9 second 0-60 on the street with the following mods, with maybe $1,025 spent. I could have spent $500 less, but didn't realize it until recently.
- $100 intake
- $625 Cobb V3 tuner (could have done this part for $100)
- $300 downpipes
Here's the video:
https://youtu.be/ScpFqaJL5Ws
I suggest you not bet any money on a race with a modified 335 unless you're at the track with good drag radials, as that's where the SRT6 really shines.