98% of the TT stealths you'd encounter on the streets are low 14/high 13 second cars. Sure there are guys in the low 12's/high 11's with them, but they are few and very far between.
Back in the 90's I encountered two at the track and they wanted to race when they found out my mods (K&N, chip, drag radials, pump gas) but after my first pass: 12.84@103 they threw in the towel. After many attempts, one ran 14.1's, the other 13.7's. Both had mods (the 13 second one had $1000+ in mods).
This was fast pre LS1, I guess, but an LS1 kicks the crap out of them in absolute performance and performance per dollar (except in adverse weather).