I don't use the secret, very narrow ways (can be learned in factory driver), only the ones shown in the track map. The best for me is the second turn to the left. There are also very narrow streets to drive, but there are no sharp corners to take this way. Btw I've never tried the first one, the one the computer drivers usually choose.
I started to play NFS 5 again. I'll try to beat my old records, because they're not so fast. Only Zone Industrielle record is really good, because it's the only track record made after I've adjusted the gear ratios (or Pyr?n?es, too? maybe).
My records were done: with automatic transmission, with keyboard, without cheating, without any car tuning operation programs (I heard of them), without adjusting anything in 'force feedback' section (or is it only available if you have a steering wheel?), without discovering all possible shortcuts (although I know most of them), with car damage 'ON' (possibly the most important rule), with tuned cars, also using fine tuning (expect for gear ratios in most of the cases), without driving the tracks mirrored/backwards.