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I had a Stg 2 WGA with Stg1 and it made a noticeable difference, almost too noticeable (24 psi when I first put it on). If I had it to do over, I would have gotten the Boomba with the built in manual boost controller. I also hear nothing but success stories about the AGP.
get the kinetic wga if you go to swiftmotorsports.com they have them for 95$ shipped and its adjustable and the spring is rated around 18psi but oyu can adjust it
I JUST LOOKED AT THERE WEP PAGE FOR THE WGA AND SO FAR THATS ONE OF THE BEST PRICES I'VE SEE. IS THAT WHAT YOUR RUNNING IN YOUR CAR RIGHT NOW? WHAT PSI ARE YOU BOOSTING AT REDLINE?