If you buy everything from the dealer new about $450.00, $300 + just for the cylinder. But I did it for $160 by buying the cylinder off of ebay (on a good day!). I did have to buy the two brackets though and that was $140.00. If I had to do it over again I would just sell my two way and buy a 4 way on ebay! I didn't save anything doing it the way you're considering.