Mine is stock except for the GM Hei module and the temp sensor tweak. I have had it on a dino 2 years back at a local shop that builds rally subarus. I have spent the last two years trying to get it back to factory specs. Crazy thing is, it felt great before the dino run. Since the dino run I have done the injectors, all the injector conectors, fuel pump seals, petronics flame thrower ignition module, petronics coil, checked and calibrated afm, temp sensor tweak and clean all the ecu harness terminals. With the lightened flywheel, close ratio 5 speed and the 3.7 diff it is so muchmore enjoyable to drive. Im happy with the "stock" setup and like Zed head rarely go above 5,500rpm. A lot of people think there engine is producing what it should according to specs, but mostly over the years wear, ecu drift, poor adjustments and simply old aged parts slowly reduce the power that you don't notice it or you bought the car already like it. In the end you have to decide what you want to do with the car. Read a much as you can without getting lost in the jungle, so to speak. Thats the problem I find with the internet, you read so much that you get confused or read so much contradicting information that you can make your mind up. Chas