I had my 02 reg 530d Sport mapped by MSD in Blackpool (Evolution Chips - 01253 508400) - Absolutely perfect. Superb service and perfect advice before you buy. - Mine was on 112k miles when I had it remapped - the car drove perfectly aswell, just like the day it would of done when leaving the showroom
Standard, the engine (on post 2001 cars) is 192bhp and about 300 lb/ft - The remap takes it upto around 230-240bhp and 360-380 lb/ft (don't quote me on the torque figure, I've slept since then) - A stunning result and the car cetrainly performed faultlessly with very little increase in smoke.
The only other thing I had done with mine was a K&N filter that replaced the OEM filter in the standard housing - mainly due to it being cheaper for the K&N than the standard BMW item, but this too resulted in better pulling and much improved crawling on tickover.
The car also managed a sub 9:30 on the Nurburgring aswell - not bad for a diesel bus that weighs in at nearly 2 tons
Get it done - you won't be dissapointed!!!