I am the customer that Dino is referring too! LOL. I have the video, just haven't posted it yet as I only could record it on my phone, and it's hard to see the cars.
I bashed with other members of the board, none of whom had a Jetpro pipe, and we were able to do a "drag race" of sorts. We were all - VERY PLEASED by the Jetpro.
To get it to fit you do have to use an extender plate. The plate extends the rear bumper so that the pipe lays in the rear bumper like a cradle. If you look at the pics I took and uploaded after I got my new body, you'll see the pipe installed.
I just started tuning the carb, and I can tell you even without this thing being tuned nicely - it definately helped performance considerably.
You can in fact run it with no bumper, but that would mean that the Pipe is not bolted anywhere, and would definately break if you were to land on the rear - it's not a good idea!
My only recommendation if you are talking to Dino is to tell him that he needs to come up with a better idea for the extender plate. He used very thin sheet metal, but just from very minor use (I only got to run my truck once with the pipe before the 900 consecutive storms in NJ hit us) it's already warped. I have bent it back into shape and it's good as new, but it's going to get annoying if I have to do that every time I run the truck. Carbon Fiber would probably be the perfect thing to use in my opinion, or thicker/less pliable aluminum.
If you want additional pictures of the pipe/bumper extender mods etc just ask and I'll post em up.
I can even post the videos, but admittingly they aren't great quality.