hmm I'm noticing a lot of surge in city driving and the loss of torque is very apparent , more so than the gains at top end. stock exhaust with catted dp was actually perfect. On the x5m in city driving most of the time the rpm range in d mode is 1000 to 2000 and will shift into 4/5/6 before you even reach 60.
maybe a tune will help
Alpine White E70 11 X5M - K&N Filter , STI Mag , LI , Ultimate DP , Megan Exhaust , AA Tune
Jerez Black E92 10 m3 - STI Mag| LI | RE SSK | AFE Filter | Fabspeed XFC / Xpipe | AA ECU 1.5v | BMW PSW | | Envy Charger | Megan Exhaust | Mich SuperSport
Jetblack E92 08 m3 - V1 | RE SSK | RR Scoops | AFE Filter | AA ECU <Retired>