What Exactly is Allowed to be Modified when you Turn Off Tuning?

[RedlineRacer]

What exactly is allowed to be modified when you turn off tuning on online lobbies?

I am hosting an event soon and I need to know what is allowed to be modified on cars and the game won't dis-allow it. I know you can do oil change, but what about some other things? Thanks.

 

[Vic Reign93]

Only things you can modify and still be eligible are, Brake Balance, rims and paint.

 

[VBR]

I think you can also add anything from the place where you get an oil change & still be OK, like Body Rigidity etc.

 

[JockeP22]

・Vehicle Tuning
Set car tuning options. Select "Prohibited" to only allow cars that have not been modified since being purchased from the dealership to take part. Tyre changes, as well as a limited selection of other options (traction control, torque distribution, ASM, ABS, and front and rear brake balance), will not be restricted.

 

[CraigHyphenO]

Tyres, brake balance, rims (provided that they are the same size), paint, and anything from the GT Auto.

 

[TexRex]

Don't shoot me if I'm wrong, but I'm pretty sure even aero parts from the first category are allowed (usually custom front bumpers and side sills, occasionally with canards, and, while far less common, occasionally rear bumpers as well) as they don't affect performance. Obviously flat floors and rear wings are a no-go, and even the optional soft top in the 'up' position on the BMW Z8 kept me from using said car in a tuning-prohibited lobby.