Well I thought anything and everything was broad yet specific. Lets put it this way, engine/drivetrain: cylinder head flow ratings, cam profiles, bore/stroke, ratio's for the transmission, drive gear ratio, etc. I like to know the in's and out's of vehicles I own. I just sold(yesterday) my '98 supercharged Cobra. I did about 70 - 75% of my own work on it from tearing down the engine to installing the supercharger to tuning it for street/track. Only thing I didn't touch was the rearend. I like to know for my knowledge and for any possible future modification combo's that I might want to try.