well the n/a came with a 112hp motor stock (small port 85-86/large port 87-89 16v) that puts down right around 98whp...so the drivetrain loss is almost nothing!!! the silvertop 20v (160hp) and blacktop (165hp) motors, both high compression, VVT equipped with stock ITB's swapped in the cars make them an amazing track car. remember those are 1.6l motors that make better hp than even honda n/a (b16) and are capable of much higher numbers. so 171whp from a 1600cc motor is pretty good really. there are some guys in europe making 200+whp from the small port 16 valves with stock headers but they arent very streetable. also toyota atlantic series still uses the small port 4ag in some of their cars making 240-250 whp and able to rev past 12k (restricted to 9-10k)!!