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basically an engine is controled by an electronic fuel map within the car's computer, the stock map is the same on EVERY car of that make and model, a remap is basically this map adjusted to suit the engine and moddifications on that specific make/model
yes you can (hillpower are the company you should speak to if its a mk1 1.4 RT) but if its worth it or not is entirley up to you, its not mine nor anyone's place to tell you that
The ecu stores fuel and ignition requirments for a given load/speed event. the best way to describe the data is in a "look-up table", whereby for every load and speed event there is a certain fuel/ign value to make the engine run. this value on a stock ecu however isnt optimum for performance. basically, "remapping" changes the fuelling and ignition variable to increase perfromance.