I had this done to a 2.3CSE Turbo. There is noticeable difference in performance, torque and driveability. Get the upgrade you will love it! BEWARE do not go for a cheaper option such as 'Superchip'. I went down this road initially and it resulted in the car having an erratic idle due to the conversion being based around a bleedvalve. The Abbott upgrade is based on a reprogrammed ECU and did not result in such problems.