I recently had an upgraded chip put in my '98 VW Jetta. They're best if used in conjunction with other performance mods. For example, I got an Autotech Tuning chip, a Techtonics cat-back exhaust, and a K&N performance air filter. The whole upgrade boosted my car's (2.0 liter engine) horsepower from 115 to about 135 with comparable increase in torque. It drives like a new car, even though there are over 100k miles on the odometer. The whole thing cost about $600, chip was about $100. They have to get the right chip for your engine. It's tuned to handle engine management tasks better than the stock computer chip. I haven't heard anything about chips for Deloreans though. Word, Paul D.