NFS Underground 2 also suffers from the same problem. I think I found the aspect ratio address 204D1614 , but for me it's complicated because the game already has built-in 16:9 mode. The trick to NFSU2 is that the game stores the aspect ratio and rendering values separately for full-screen (4:3) and widescreen.
Underground 1 has hood decals, different vinyls that you may prefer, hatchbacks have different spoilers and (personally) a better soundtrack. But Underground 2 has freeroam, more parts and vehicles (however you miss the Dodge Neon, Honda S2000 and original Lancer and Subaru Impreza.6bftdk.