reply to Charlie
I finished installing it myself about a week ago. I have about 200 miles on it since and I'm really pleased with it. It is so much more powerful than before and yet silky smooth in all the gears just like a stock car. It literally leaps when I put my foot in it now and it screams like the Cobra, but it is much easier to drive and control. It took me about 20 hours altogether ( I was in no hurry and I'm kinda fussy about the details), including upgrading to the Corsa exhaust and also putting Z06 grills and perforated housings behind them in the front end (for a little more air flow to the intercoolers). The instruction manual is very good and if you follow it you should be able to do it yourself too. I'm not a mechanic myself, but I have restored and built several cars over the years, so I'm "dangerous" and not afraid to try things like this myself. My advice to you, if you think you might want to install it yourself is to make sure that you use a hoist like I did (I have one in my garage) rather than trying to do it with jackstands and laying on your back. the hoist makes the job so much easier.
If you are serious about ordering a system, John Harris can have ProCharger send you an instruction manual ahead of the delivery of the unit so that you can have a feel for what is involved before you start on it. That's what I did so by the time it got here, I was familiar with the steps involved.
The other thing that I highly recommend is that you order all the GM shop manuals for your car like I did before you do it. You can get them from Helm, Inc. (the publisher for all GM manuals). Your owner's manual has the ordering info and you can actually order them over the internet like I did. They aren't exactly cheap, but they are great to have anytime you want to work on the car. They are invaluable if you need more detail about something that you are working on while you do it.
Attached is a picture of my 2001. If you look closely you will see the Cobra and 66 Vette stacked in the garage with the hoist.
If you need any more info, give me another shout.
Hope this was helpful.
Craig