Then using larger bars and lower profile tires then these cars were engineered for can’t be good for the car either. Those bigger bars are gonna cause more stress on the initbody then the undersized ones these cars were designed for. And those low profile tires absorb a lot less of that shock then those big sidewall 14 inches.
Surely, if you drive it hard anyway. But it is a question of how much more stress. The rear anchoring points for the T-bars are a well known area of stress and are prone to rust. But they are better engineered to take stress than the front end is.
