@esn1937 if you play on rockstar offical servers you will get banned with in 2 days. and your friend won't even be able to see your car. only you will be seeing that car. your friend will be seeing normal gta 5 car if you used a replace version. if you use, add on your friend will see empty transparent car and your player hovering in air.
and if you both have the car then you will see the car but both of you will get banned with in 2 days. that's where fiveM and such servers come in handy to play modded game on modded servers. don't do it on official rockstar servers.
Topic has to be locked as this is against forum website rules. we can't discuss online game modding here. hence the ban etc.