1. which zc pistons for my sohc z6.....dohc or sohc and what year? 2. 94 ex coup doors fit a 94 dx hatch? 3.does gsr obd2 vtec need a 1volt ground to work or just ground to head? no vtec in swap. i searched all these and found no anwers so be nice and i didnt want to post three diffrent threads becuz that seems like a waste of space. if you can help... thanks.