I had 4.57 in one of my cars long ago and while it was perfect at the drag strip, 3000 rpm was at 55 mph.. It was fun for a while then I got sick of it and swapped for 4.11.
I had a 3.46 in my ZHP but swapped it out for 3.15 because I do a lot of highway driving.
Dinan CAI &Throttle body, ESS Tuning TS2, Bimmerbrakes gen3 headers, UUC SSK & DSSR. Achilles oil pump, VAC oil pan baffle
M3 Motor mounts, UUC Trans mounts, Modified clutch style LSD 3.15, TMS front subframe reinforcement, Koni Yellow sports,
H&R sport springs, UUC sway bars, BMW Perf. Rotors, UUC SS brake lines, Hawk HPS pads, CSL replica wheels,
Rotora strut bar, FXR HID conversion, M3 Mirror conversion, BSW stage 1 speakers