Hello there!
I’m attempting to re-create Los Santos Customs and it was going well up until I decided to add the trick to preview vehicle modifications. I have managed to work it out for suspension, paint jobs, etc. but I can’t figure out how to sound the horn for long enough when there is a player in the driver’s seat.
I have attempted to create an external vehicle then attach the horn to be previewed to the new vehicle and sound it that way to no avail. In doing that, I also attempted to create a ped and spawn it in the vehicle to see if that would help but also didn’t.
I have attempted to warp the player out of their vehicle, sound the horn, then warp them back in but again, no avail.
If anyone has any ideas, I will be more than grateful because I have spent the last hour or so scouring through Google 

