they were in the `94 and up GSR manifolds...

this is only to keep it as a nice daily with low end grunt and still move enough air to keep you happy up top...

most people ditch that setup for the skunk2 or similar just to have the intake opened up threw out the power band...

one last thing... just a hint... you can pull the vaccum line off the actuator and it will leave the plates open all the time... just a little free mod for you guys...
-Keith