The best way would be to hook up an electronic boost controller (such as AMS 500/1000 or an MSBC-1) with CO2. The problem you run into without electronic controllers is trying to run low boost while maintaining fast spoolup. Running low boost requires running a softer wastegate spring, which hurts spoolup. Thats where the CO2 helps. You can launch/spool like you have a stiff spring made for 30lbs of boost but limit the top end boost to only 22lbs.
Otherwise, you just put in the wastegate spring you need for the boost you want to run. You can run a few more pounds of boost by tightening down the top of the wastegate. As far as spoolup, you get what you get as there isn't really anything else left to adjust. If you are running high boost, the spoolup will probably be fine. But if you want to run low boost with a weaker spring, the spoolup won't be as good.
There are some other issues to watch out for such as making sure you have a big enough wastegate pipe/hole that can bleed off the boost for high flowing motors. Running the wastegate pipe off the header pre-turbo will give the best boost control. High flowing motors can still have boost creep issues when running an external wastegate using the stock wastegate hole.
I didn't have any luck with using manual boost controllers with an external wastegate, especially if you like to change the boost/tune a lot. I think the MAF pro can be used as an electronic boost controller too, but no experience with it.
IMO, if you don't run into some of the issues above with an external wastegate, you could probably just run an internal wastegate or maybe convert to a larger puck like the RJC one and be fine. Or maybe you just want the convenience of having an electronic boost controller. If you are just running an external wastegate using the stock wastegate hole and no electronic controller, you are not gaining a whole lot except maybe the ability to prevent some boost creep if you using a large enough diameter pipe coming from the wastegate hole to the wastegate and the wastegate hole is opened up to match the pipe. This will give you more bleedoff from a stock wastegate setup, but you could do the same thing with an internal wastegate downpipe using a larger RJC puck setup.
Thats my 2 cents. :biggrin:
(by the way, my setup is a Racegate setup with an MSBC-1 electronic boost controller and CO2. The wastegate runs off of TA headers with a fairly large diameter pipe. I can dial boost from 10lbs to 30lbs with the touch of a button while keeping spoolup the same. The large wastegate combined with a weak spring lets me run down to 10lbs while the CO2 allows good spoolup and lets me go up to very high boost while keeping the same weak spring in the wastegate.)
