They are definetly not twins... Cubic inch is undecided, too much other work going on at the moment. Ultimate goal is to run a mild 8-10lbs of boost, and run 1/4 mile in the 10.50 range. Turbo on right is the one I am going to use, 92mm T4 flange with 4.5 inlet, good to about 1100HP. Turbo on...