HAHA!! usually i would agree with you...but we're talking about d series engines here man!! the best all motor d series engine is still inferior to the worst b series. however, boost is boost...and boost on a d series is not that bad.

back to the topic: if you're looking to make the car faster without spending much money, then do a head swap, get some bolt-ons, and do the little stuff. you'll still be a little behind a b16, but you don't have to change the engine.