I just recently purchased a 89M3 with 80k on it, with a dinan chip, borla exaust. And it just is not that quick the stock specs say it is 0-60 in 6.8 sec but mine is like 9.0 sec. Any ideas It seems to dog out about 5 thousand RPM's I thought there torque vand was at 6k RPM? It just seems to be doging, like the power is there but hesitating. Is the dinan chip good or should I change it for another? Any help is great. Thank you.