With a pair of these wedges, they become a former-pain-in-the-ass exhaust clamps as with the wedges, it becomes a 2 minute process.
These wedges can be made by anyone with some flat steel stock and a way to cut it and a grinder.
First the photos:

Here are the wedges in action holding the springs open.

Here's the part number of the big one. I don't know if it's something you can still order, but it is a genuine VW/Audi part. My dad got a few sets when he worked at the dealership.
So, how do you use these, you ask?
It's simple, and doesen't involve messing around with prybars, weird u bolt openers, or the weird clamp opening tool. Here's what you need:
EYE PROTECTION! You are forcing these springs open. I made the mistake of dropping one once, and there is enough force to send the spring flying. It flew at me and took a large chunk out of my eyeglasses. I can't stress this strongly enough!
Your wedges.
A set of channel lock pliers.
2 minutes.
1) Take the big wedge and jam it into the C clip as far as you can.
2) Take your channel lock pliers and adjust them to get a good grip on the downpipe.
3) Rotate the downpipe with the pliers as to force the C clip open further
4) Jam the wedge in as far as it will go.
5) Repeat a few times until you have the C clip open pretty far.
6) Rotate the pipe the opposite direction. There should be sufficient space to get the C clip off of the exhaust pipe.
Do the same for the other side, and your exhaust is off!
To put them back on, put the wedged C clip in place, and rotate the downpipe as to open up the C clip enough to get the wedge out. Repeat. Done.
If the exhaust clips are going to be off for a while, it is best to take the C clips out of the wedges so they don't get stretched out.
I hope this helps, and maybe will save some of you guys some time. Maybe someone on here could even market the things.
Garry