there is no problem using model modifications. but the thing is it wont be considered legit from the game.
the deluxe mod has handling and dff modifications, which if you want to stunt in the gtas way, you'll have to play the normal game with only dannye's scm.
but if you want to make  videos like this and posting it in the VC Modded Stunting Videos there is no prob i suppose.

and cool vid :p

I can't switch back to original VC because I am used to modded cars now.

Hahaha, epic mods. Btw what's the music name in the 2nd vid please ?

I think it's Flux Pavillion - Night Goes On

Dobrodošao!

Hvala.

Here are some of my stunt videos:
GTA Vice City Deluxe Stunts Part 6
GTA Vice City Deluxe Stunts Part 7

In the videos I used the Deluxe mod and Dannye's Ultimate Stunters Trainer.
View my other stunt videos and tell me if they are any good.