actually, i believe it can be done for a relatively small amount of money. in the 80s, chrysler used their turbo 2.2 & 2.5 liter engines in many many different vehicles(including the vans). there are many ways to make any of these cars very fast for not alot of dough.
Big boost, junkyard coolers. Yeah, I have followed these guys for a while, you can get them in the low 14's on junk, but you gotta do good internals to get 12's ( thats not cheap ), but this guy is impressive, thats my kinda fun.
Looking at this http://www.turbovan.net/modifications.html
what he spent on a 12 second car, I got a used focus. Then once he figures in gas and track fees and stuff, I'll only be at 15 sec or so. Wait, nevermind, I already spent that extra $2400 on parts and gas and other crap. I coulda had a 12 second van instead of my focus. Oh well, I'd take the Focus over the van anyway.