what FSAE team are you on? ive heard quotes on ours as high as a million dollars i guess thats including labor, R&D, parts, and everything else that can be piled on. ya we use the F4i as well, its a good engine. as far as the transmission, i was going to just run a chain to the driveshaft. no need to use a honda tranny. as far as the rear end, i havent really looked at it closely yet cause my rex is up in cleveland right now, but im sure that it can be done with enough machining. ive just been thinking about this hybrid lately and thought it would be nice to share. i gotta say that the torque would be a problem at the strip, but once the car is rolling, who needs torque? ive got revs and plenty of em! god i cant get over it. this car would be ridiculously fast!