OK using Same mods F30 320i limited traction just ran a 14.1 really bad gas map 5 so as M&M posted I have to agree on the 13.5s for modded 320i F30.
13s capable just with new tires and 95OCT (AKI) real gas not the crap I get here. Not fast by any standards...just wanted to see what it runs.
check vid
last 2 passes vs. N55s this is a new track so traction is not optimal.
About Taiwan they use upgraded turbo and water injection. N20s are popular there. I have seen the numbers and 12s is common. They are shooting for 11s now. Lots of broken axle shafts and blown motors so it is not like they are not pushing those cars to the limit. I believe there is one person already getting upgraded custom pistons for one FBO 320.
BTW have you guys checked out MANHART with their new reflash. Puts the N20s at 446Nm of torque way over the 420Nm of 328s with the same stage 1 reflash.
http://www.shop.manhart-performance....ormance-Kit_23
http://www.shop.manhart-performance....ormance-Kit_26