I have a Rockford Fosgate P3L-S10 sub and box with a RF grille added and a Kenwood Amp that are almost brand new. I had these installed in my 2007 F250 and ran them for about 2 months before I totalled my truck. Tried putting them back in my 2008 that I bought, but they won't fit behind the seat and my truck has the factory installed sub behind the seat already. I paid $550 for these when I bought them new in November 2009. Will sell them for $350 plus actual shipping costs. Local pickup available as well. Located in zip 37643(Johnson City/Bristol, TN area). The sub sounds awesome and they amp is perfect for powering them. They both fit behind the seat in a 1999-2007 Crewcab perfectly. Any questions feel free to PM me or I can give you me number to call as well. Thanks.