[nonovurbizniz]

You COULD get 3-400 hp out of a d16 (would it be drivable or realistic or long lasting....no but it can be done)

if you built up the whole bottom end of your engine (crank pistons rods rings, block posting or block guard etc....) and the top end (valves, v-springs, retainers, cams) even with out boost or nitrous you'd SMOKE a stock gsr motor.

Is it worth doing all that work to get THE ABSOLUTE PEAK HP out of your little motor instead of swapping in a bigger motor which will appease your n.f.s. for a while then build up that motor to get better numbers that are more reliable.... NO

Go For The Swap but not cuz it's impossible to get hp out of a smaller motor. just cuz it's a better platform to start with if your going to poor all that money into a car.

even with a light build (polished crank, shot peened rods and higher compression pistons block guard) up to a d16 you could get more hp's than a stock gsr. (especially if the gsr beat (start up guarantee and will run well are 2 totally different things)