I'm loving mine as well! The sound is great. I did find a pair of 18" magnaflow 4" tips on Ebay. Brand new and I paid $30!!! Those will hopefully get welded on this week or early next.
With the muffler only, you still have the factory resonators on the tail pipes, so I think that mellows the sound a little more as well. My thoughts were that the factory exhaust is all stainless, so I didn't feel the need to replace it all. When I get the tips welded up, I may replace the resonators with a section of stainless, thereby eliminating them. That's still up in the air yet.
I did post pictures and some video/audio of it here: