Looking at both, I know prefer Diablo..the chip fits more securely in EEC (less likely to come lose), and seems better made (looks like it anyway). Chris Wang did a side by side comparo on his car and Diablo made more power than Superchips in that particular application. But I would bet in other cases, superchips comes out on top. But as Kinger said, this will vary from car to car, mod to mod. Really depends on how well the chips programming matches the car...some cars will be close to perfect match (by luck) others will be way off. So, whatever chip you get, get it custom programmed while your car is on dyno with A/F measuring..
