The stock figures for the GTS-t were 250bhp 219lbft, so I'd imagine weight for weight, it'd be slightly quicker than your Supra.
For £5k, you'll be looking at a car that's fine, but maybe in need of a little attention here and there.
Check my car in the forsale section, save yourself a wad on tuning, and make me an offer. I'm looking for a tad more than £5k though.
