Yeah, I have the original Street Legal. Graphics aren't too cartoony (like Racing Redline) but they aren't that good either.
I suggest running your graphics at low so you handle the shitty slow gameplay (600x400 - 16bit blah blah don't know the rest ).
It's a nice game to play every once in a while because it requires a bit of understanding. You can't just buy a turbo and double click it expecting it to work - requires manifold, connection, air filters, etc.
It's not like NFSU how you click the Level 3 best turbo shit and expect a power boost without tuning.
I could only play Redline for a few moments since I downloaded the demo, but the stuff to buy is much better.
Oh, by the way, in Street Legal (original) there is brand names and real cars like a Ferrari that you can buy and install a pretty tweaked out V12.
It's a hard game to play, though, since there's a bit of lag and lots of bugs causing crashing all the time but yeah, as Twitch said:
Very good (or more 'unique' and 'realistic') gameplay compared to more better graphics and better programmed games.
In Street Legal (original) you can have the best acceleration and a tweaked out Ferrari but you can only get 240MPH top speed.
I managed 240MPH in my V6 Twin-Turbo.