I have been sent a modified P84 ecu which ive been told will improve the performance of my prelude ( 1993 uk spec 2.2 vtec with 140,000miles on it).

Ive fitted the ecu and have noticed a hudge difference (car is really fast) will this ecu be ok as everything is working fine including 4ws and cruise control or will it cause me problems?

Any help would be very appreciated.