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I have a Mugen ECU N1 - which I have run on my 2001 AP1 - These cost US$1,926(AUD$2,100 plus shipping) new from King Motorsports - adds better throttle response, no "heat bog" and transforms the car if you have an exhaust & a CAI.
Also forgot to add that the ECU is plug & play - takes about 20mins to install yourself, let the car idle for around 15mins to learn the car and you are good to go.