Think about it... even when you hack bodykits..you still pay boost or cash.
Plus ALL the cars have the same neons available.
HOWEVER! I can try...and if others want to also, hack a car into Camino SS blue juggernaut, and somehow keep the neon, when they revert back to original car.
If that doesnt work...you can always go parts farming in Home Run or High Stakes and get neons and rims etc...