I have recently been looking in to mapable ecu's. One company i have been speaking to is the Angry Turbo Company (ATC). The chap who owns this company really knows his stuff. i know the theory of using one is good, i.e can map the car to accomadate particular mods etc. but also gets rid of the Motronic system which uses Air Mass Metering to measure load which can be restrictive when modifying.
Does anyone else have a mapable ecu for their turbo vaux? Are there any major problems? is it really worth it?