All my opinion:
There are a lot of "grey areas" for bolt-ons. A few things depend on the person's mechanical ability, too. If the part can be bolted on or modded by you, then have at it.
I look at it this way....stock turbo and stock rods are the ultimate limiting factors.
Modded reg/suction pump are fine with me, because a person can do it themselves (based on the DIY). One of those Wicked-style completely modded CP3s, no.
Fiberglass body parts (other than hood) will probably void the run...keep that in mind. Sitting on milkcrates will also void run based on safety issues.
Last year, I didnt think injectors would be "illegal" because lower pulse should balance the larger nozzles. Who's crazy enough to run 3200us pulse with bigger injectors on a stock motor?
Even with a modded regulator/suck pump, a single stock CP3 cant fully keep up with 30-overs at WOT with even 2700us pulse, so there's your limiter....but thats again just my opinion.
Going a start working on my truck tomorrow, finally.