Those are a set from my 400EX - they are not setup for the 450R. For now, they work well enough for series I'm running.
All in all, the PEPs are a nice shock, but I do think they get more credit than they deserve (keep in mind I have 3 sets of PEP ZPS shocks) -- at least for the average buyer. Maybe the national level pros get better stuff or more attention paid to their setups, but in all my experience there's nothing special about these shocks compared to some of the others I've had (I've got experience with all the major shock builders) - especially when you consider the wait (I waited 5 months for my first set, bought my other two sets used).
My favorite set of shocks is a set I had built by Lazarus at GT Thunder. They were originally Works bodies that TCS had setup - I then sent them to GTT & had 5/8" shafts installed, heim joints, and new pistons - best shocks I've had so far, even better than the Axis shocks I ran for a while.
I think the smaller shock tuner will spend more time with you and your setup, granted he knows what he's doing, you'll end up with better suspension in the end. I know GTT asked me a lot more detailed questions about my suspension than anyone else has - important info the other guys apparently don't consider.