I can make a N/A b series go faster than a d for the same or less money. Period. And I have lots of room to grow as where the d must be fully built to pull out any more power. Turbo kit and its acessory trimmings for a D $3000-$5000 plus Labor $1500-$2500. Dude. I can set up a sweet B series for that. B18c bored to a 2.0, type R pistons, head work, type R cams etc and still spend Less Money and be as fast or faster with room to grow. D stands for DEAD END even on a budget. But don't get me wrong, I LOVE my d-series! My daily driver gets 40mpg! Wooo hooo!