Did some looking on both sites on-line, and found they are similar:
ZZP Z7 Turbo kit $2499.99 - Base kit:
$ 300.00 - Turbonetics 62-1
$ 90.00 - PCM
$ 220.00 - 42# Injectors
$1099.99 - A/A Intercooler
$ 65.00 - Boost Ctrl
$ 200.00 - Ceramic Coating
$ 200.00 - Cat'd down pipe
$ 50.00 - M90 Plate
TOTAL: $4724.98
Cartuning Performance Turbo kit $3099.99 - Base kit:
$ 389.00 - PT-61
$1099.00 - A/A Intercooler
$ 79.00 - Boost Ctrl
$ 209.00 - Ceramic Coating
$ 100.00 - M90 Supercharged Option (M90 block off, gaskets/hardware/etc)
$ 100.00 - PCM refundable core
TOTAL - $4975.00
Just a side note, Cartuning Performance website does not have all the current set-ups that they now have to offer. I know that they are using Turbonetics Turbos, and they have upgraded their Turbo kit too. They have cut-outs (welded in the down pipe), fuel pump rewire kits, water/mets kits to go along with their Turbo kits. I'm sure if you give Kevin a call, he can give you all the info on what he has to offer, plus other projects that he has on the go that'll make your GP Bullitt proof!
Just realized that he has a sale on for January: "Purchase an intercooled turbo kit for your W body, and we'll throw in the upgrade turbo (61mm unit) AND ceramic coating FREE OF CHARGE!! This works out to an additional savings of over $600!!! On top of that, we'll be including the LT1 maf and boost controller as well!"