i have spoken to lots of people using H&Rs and they love them! the springs are designed for the 320 i have been told, but i have seen several 430s with them. because of the added weight with the 430, the front rides a little lower than the rear. using thinner spring pads in the rear will even that out. with 19X10" wheels and 256 tires, the rear fenders will have to be rolled i believe. this spring is a very high quality product and is approved by the german watchdogs for use in germany. i can steer you to a pic if you want to see what they look like on a 430 with 19" AMG wheels. very nice.