[EN] Tuning spoiler fix

Can install tuning spoilers in cars already with spoiler

What?

If your car already has a spoiler, when installing a spoiler in a tuning shop, it will have two. This fix is intended to solve the problem.

Fix

Simply use the name f_spoiler on the spoiler node and VehFuncs will do all the work.

"Unintentionally" your car will also be adapted to Downforce Mod