ok so i'm not sure if the OP ended up with his question fully answered so I'm just gonna ask,
OP, did you decide which ones you're getting?
Because I have Original 40's welded on mine. Still have stock pipes and the tips from the stock mufflers were cut off and welded to the 40's. Now i don't have any videos of mine but if you haven't made your decision yet i'd be more than happy to compile a video of take off, highway, and cruising sounds to give you a better idea of how it might sound. Now mind you i have a JLT CAI and a 93 performance tune but it'll at least give you a decent sound bite.
We like our 6's to sound nice and beefy FOR 6'ers. It's obvious we'll never sound like an 8 and i for one absolutely love the sound of the 40's. I still get compliments all the time at work and when i've done a little play racing around my area with other random cars. They ask if mine's an 8 (and that's probably because they really just don't know the difference in sound like all of us here on this fine forum) and they are always pleasantly shocked that mine's a 6 (and that they got dusted...lulz) but i digress.
IMO: 40's work wonderfully for the 6, if you haven't made your decision, i can make a video clip by Wednesday, probably. Let me know!