Need for Speed Carbon was pretty much Underground 3. No idea why it didn't get the praise it deserved as it was a fantastic game. Then there is Juiced and that's all I really know of that are similar.
Might be worth checking out Test Drive Unlimited 2?
Can't remember how in-depth the modding system is though.
Shift 2? Track based, but has modding.
Shame they don't release Forza for PC, I would gladly pay full rrp for that! Hate playing it on xbox now though as I have been spoiled by PC graphics and loading for too long.
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