My latest addition is this Blitz Access ECU. This is a standard 4A-GE 20v Blacktop ECU that has been 'chipped' but Blitz in Japan, and offers more aggressive fuel mapping, a rev limit of 8,500rpm, no speed cut etc. Straight after installing it I could feel that the midrange power was noticeably stronger, allowing the car to get into it's power-band sooner and pull consistently until redline. The performance is similar to the 6-speed ECU I was running previously, but this one has a noticeable 'kick' to it when you put your foot down. I have to give the ECU some time to adjust to my mods and driving style, but so far the upgrade seems to have been worth it :)