Unfortunately my clamps refuse to lock.
I'll make a video of how I was able to get it tomorrow.
If the clamps don't lock it's still possible.
1. Get car on ramps or in the air
2. Disconnect necessary cables/hoses to get room
3. Pull hose going from symposer to engine bay (its like a big wire loom, hollow, pulls right off easily with some twisting)
4. Pull symposer out toward front of car - it's stuck tight but will pull out of the grommet/orifice
5. Like suggested above spray some silicone lubricant around there, it will seep in and help a bit
6. Now bend the entire symposer assembly to the left toward the passenger side
7. Now you have a little room to work - use some small vice grips to grab the clamp and hold it in the open position
8. Now go underneath (since you're working on the bottom clamp) and use a thin screwdriver to pry in between the pipe and the hose...keep prying all around the circumference of the hose until you see it start detaching...pry pry pry till the glue seal is broken...watch out for falling grit/debris
9. Once the seal is broken go back up and grab the symposer, pull on it like you're pulling Excalibur from the stone, pull twist and grunt until it comes out
Hope that helps. That's what I did, it took me about 20 minutes.
If you're still stuck and trying to do this tonight PM me and we can facetime/phone call and I'll show you what I'm talking about. I'm up till 10p EST.
You can do it just keep at it...it will come off.