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Performance Modifications For All Saab Models:
HyperBoost Adjustable Valve
"For the application that requires that extra level of attention and fine tuning. The new HyperBoost Adjustable valve has all the features of our successful regular valve, but with adjustability. How does it work? The HyperBoost adjustable valve is preset to operate just like our normal HyperBoost valve, but that's where the similarity ends. You can pre-load the valve spring infinitely from 0-6mm. This can give you faster on-throttle response and later release of boost pressure. In addition, more boost pressure can be retained. For a killer level of freedom and tuning, the adjustable valve gives you the flexibility to dial-in a few mm of pre-load if you like. [Installation should be checked for clearance (a small vacuum hose extension could be needed in some applications)."
Price: 180$
Available in Stealth Black Anodized or Flash Silver from
01 Sep 2004 by admin

by fastyellowsaab @ 19 Jun 2005 09:09 am
I have run this and other grp9 mods and have always been very happy with them!!

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