Our Prolite stainless steel muffler for the Ski Doo 600R only weighs 7.5 lbs! So its almost 10 lbs lighter than stock. It has all mechanical baffles in it and never needs to be repacked. No other modifications needed to install it. It is louder than stock but not obnoxious. A great way to lose a lot of weight for your machine with a great sound.