Wmcforum,
“@elliot, you know the score, if you want to make changes to any car – ask the owner. If you want to make invisible changes for the duration of the lease and return to factory default then it’s up to you.”
I am not sure about the second sentence, inadvertently this could be taken as acceptable and an encouragement. Invisible changes may not become invisible in the case of any mishap, insurance would be revoked and any third party damage or injury not claimable.