I purchased the walker quiet flow and really liked the fit and finish, noise was just slightly louder under heavy load but only a very small amount of noise.
Here's the issue though.....the factory exhaust is about the best you can get in regards to noise and fuel economy, it's a
very well thought out system. I ended up returning my muffler/ resonator and repaired the split I had in the stock muffler casing. I lost 2-3 MPG with the Walker right off the bat.....not acceptable, this is likely due to the fact the factory piping is 2.75" and the Walker is restricted to 2.5" or less at the muffler.
If you are after quiet and MPG, I suggest searching for a used stock setup and if you do, and decide to cut the system for removal, make the cut accordingly behind the muffler to utilize an adapter sleeve to re-fit the two pieces together or have it re-welded. Cut on a straight section and not the curve. I think you can remove the shocks and with enough lift, possibly snake the entire exhaust over the axle but not sure.
Here's a thread I had on it.
http://gmtnation.com/f23/just-installed-walker-quiet-flow-ss-exhaust-8464/
I wanted to add that the Walker system had almost twice the backpressure over the stock setup. That's huge.
