ahhhh thats the thing with those kinda plenums. if the design is not flow tested etc before being made it can cause power loss and also cause some cyl's to detonate because they get less air etc etc.. thats why i went with the plasmaman.
It may be okay though because if the one on the 32 was f**ked then that would explain it. i can understand why you want to get it flow tested so maybe you should just in case.
Try ringing a engineer or something - maybe kevin will have some kinda idea where to get it done.
Also dont forget that the stock plenum can flow 500hp !! its just the location of the TB that makes em kinda crappy and a pain in the ass