tutu67 - I will PM you with prices and options tonight.
Bassplayincrowe - The front is the one with the most restriction. The back is still worth it IMO. I changed the front first, then did the back, I did notice more power once I put the rear one on. It'* actually not that hard to get to the back (I have done it too many times), just need your trusty deep socket wrench, some good strength, and a little beer. I change change both the manifolds off and on within 1 hour. Just take your time, it'* not as bad as you think.