Dav 27

i wonder if anyone can help me ,how do you go about de limiting a my 95 wrx , just wondering if its a d.i.y mod or does the ecu have to be tweeked ,which is above me head, and also the ecu thats currently installed in the car is a z4, is this ecu ok for uk optimax as thats whats its run on ,or would i be better off fitting a scoobyecu/chip thingy, isnt the z4 equivalent or near enough the same as a uk ecu ?