It has been years since I tried it on a Voodoo5, but this page has the general technique that I used:

http://www.zeckensack.de/glide/nfsfix/

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The registry changes are the part that will be necessary regardless of whether you are using a real Voodoo card or a wrapper.  Ignore the wrapper instructions.  If you want to use a wrapper with a non-3dfx card, then nGlide is probably the way to go these days.

The .INI files at the bottom of the webpage can also make your life easier, but those were not available when I tried this a number of years ago.

There is no "official" EA patch for the game to enable 3dfx/Glide, and there is no official EA support for 3dfx/Glide mode.  However, the developers did include the voodoo2a.dll, but the only way to enable it is to use the registry modifications outlined above.

If you use the registry changes listed above to enable 3dfx/Glide, you will NOT see the 3dfx splash screen when the game starts even though you ARE in 3dfx/Glide mode.

If you use the registry changes listed above to enable 3dfx/Glide and you use the 3D Device Setup program to see what mode you are using, it will report that you are in Software Rendering Mode, but you are not.  If you use the 3D Device Setup program to make changes after manually applying the registry changes listed above, it will wipe out your manual 3dfx/Glide registry entries and put the game back in Software Rendering mode or D3D mode, whichever you choose.

I just installed the game and used the registry changes above on a machine with a Voodoo5 and 3dfx Voodoo5 Version 1.04.00 Reference Drivers, and it works well in 3dfx/Glide mode in 640x480 resolution.  With 4 Sample Anti-Aliasing, the jaggies are gone and the dust and specular effects are nicely blended compared to the D3D mode.  Rendering is smooth regardless of circumstances, and this is quite different from using 4 Sample Anti-Aliasing in D3D mode.  D3D AA in 640x480 mode is sometimes smooth, sometimes jerky, and it doesn't look nearly as good as 3dfx/Glide AA mode.

Since you have a Voodoo4, you can't get as much improvement from anti-aliasing as a Voodoo5 user can.  If you tend to run at a higher resolution, any improvements in Glide vs. D3D are probably going to be more subtle as well.  If you are using 3rd-party drivers instead of 3dfx Reference Drivers, that may change your results as well (could be better in some respects, could be worse in others).

funny you're saying that, because i keep seeing Voodoo 4500 on Ebay for as much as a Voodoo 5500 are selling for, usually.

But yeah, you have to go in the registry and tweak the configs there, and same thing for the game "Future Cop LAPD", same process, just not the same game registry folder.

Also, i found that the game work best if you use the official drivers, not sure why though. I kept on getting framerate hiccups while playing with the supposedly better 3rd-party drivers, to a point where i just formatted and re-installed everything, now it seem to work just fine (without using anti-aliasing though, most games seem to drop dramatically in framerates with this on, probably because the card isn't made for latest Glide games, though AA work great with NFS2SE)