Best driving game on the PSP?

[Lauross]

Just repaired my psp, and now want a decent driving game. Ideally would like GT4 mobile but looks like it's not coming out, or just not for a looooong time. Cheers

[Pony]

wipeout pure

[Tycho]

TOCA is my fave on the PSP. Or you could get it flashed with a custom firmware and play emulators on it like Mario Kart.....