I think the current X3 35i will give the SQ5 a run for its money in its current state. DINAN is currently working on a tune for the N55 engine in the F25 and F10 with the following specs:
Peak HP 355 horsepower at 5300 rpm
Peak Torque 401 lb-ft torque at 3500 rpm
Nothing to really be concerned about acceleration wise. I believe the handling of the X3 is already more dynamic.
2012 650cic Space Gray/Vermillon Red/Blk.Top/Lux Seating/Heated Seats/Style 356/Apps/Prem. Sound(retired)
2012 M3 AW/FR NDH2/2MK/ZPP/ZCP/ZCW/752/6NR/+ all optionsexcept sunroof/OEM CF splitters/OEM CF mirror caps
2011 MINI CooperS BRGII/Lounge Green/Sport/Prem/Connect/Black Xenon/Black Conical Spokes/ACS springs/ACS exhaust/Alta Shorty
2012 X3 35i Titanium Silver/Black ZAP/ZPP/TECH/APPS/Breyton GTS/Continental Extreme DW (20's)