Excellent upgrade for M-chassis, Huge improvements over the stock suspension. Much finer tuning and adjustments of ride height and droop/rebound. Very smooth and consistent suspension action from the well engineered and built dampers. 3 sets of springs included for fine tuning the front and rear spring rate and balance. Of course, it looks much better and gives the M-chassis a lot of street creed! Absolutely the last suspension you need for your M-chassis!