I have a custom remapped chip for a 1994 golf VR6. I had it remapped 1 week before I supercharged it and it felt quite good. The car drove as if you'd just started it up on a cold winter morning. I don't rag my cars from cold but you know they are faster whilst cold. I paid £100 for the remap. Can have the ecu for £40 +postage. It has a socket fitted to the ecu and has a copy of the standard chip too. I also have a remapped chip for a supercharger for the same ecu if ur interested for an extra £20