There is plenty 20-500 in stock out there, amazon had it on sale yesterday, haven't checked today, 11.99. We have had guys running this as their choice ever since we found it several years ago, some prefer the shape. There is a "potential" issue with the smaller filters like the 10-48 and cel's. It has never happened with larger filters across the board. Chances are you can run the smaller filter without issue, but most people agree the larger filter is more beneficial across the board. Will take the sump to 7.5 quarts as well. The clone to the RP amsoil ea smaller filter has a manu tsb from amsoil that says don't use it in rams and other 5.7's. IMO it is just good form to run the larger filter,. fram ultra xg2 is also a good choice even a little larger.