I have an E46 330ci Sport Convertible with 24mm Front ARB. I just fitted an M3 Coupe 26mm ARB. It fitted perfectly but I noticed that they were slightly different in shape. The drop arms for both these models are the same part number. I was concerned that as they are a different shape will I have actually made the cornering characteristics worse. I occasionally go down the ring and wanted to stiffen up the front in preparation for my next lap. Have I done the wrong thing fitting an M3 Coupe ARB to a 330ci Convertible?