Hi all, while browsing through this thread, I thought to myself (the SDL seems more sluggish lately). So, armed with a 12mm ratcheting combo wrench, a BFSD and a BFH, pulled the SDL up on the ramps, put the rear on jack stands and began to remove the pipe and converter. Once apart, I inspected the Cayalyst material from the side closest to the flange. This being the outlet side I expected it to be fairly clean (it was nasty). I assumed that this was causing extra back pressure, so it had to go. Several hard blows to the catalyst was enough to start it crumbling. I needed a needle nose pliers to break up some of the larger pieces to allow them to exit the outlet. I then reassembled the flanges and took her for a test drive and WOW WHAT A HUGE FREAKING DIFFERENCE!!! I wonder how long it had been building up the crud in there. Well she's breathing much better now thanks to the thought provoking ideas seen here. Thanks to all who dare to try out their ideas and post their results here.

__________________
Dean