I am running side exhaust from Borla. There isn't much of a clearance issue, but my car isn't lowered. If I did lower it, there definitely would be an issue. Then again, that may be because I live in PA where the roads aren't all that good to lowered cars. I do have some problems however, with lifts that have the arms that swing in from the sides. They hit the exhaust. I have to lift the car up first before putting the lift arms under her with shims on the lift arms to avoid the exhaust.