Here's some info that TripleThreat posted in the race section.
Quote: In case anyone is wondering here are the prices for the 3 main mopar filters.The first price is list price, second price is what you will actually pay plus shipping.
The 51068 is the shorter/stubby version of the 51515. And obviously the R is the racing filter. I personally run the 51068 on my car since my headers wont allow for the big 51515 to fit.
