Hey guys thanks a lot for your responses. Active Autowerke's tune does sound pretty promising but will it also work for the N51 SULEV cars?
Turner Motorsports has a performance software specifically for SULEV N51 328's and does specify that the tune is different than the one for the N52 engines. The car that I am looking for these tunes for is a SULEV N51 328xi. Would rather do the AA tune opposed to Turner Motorsports because of the plenty who've recommended it.