Originally Posted by AzPatMan
No - the Biggboost he's referring to is the map pressure sensor fooler for people generating more than 20+ lbs of boost from the turbo, so that it doesn't cause the map to defuel the engine.
It's a part that's extremely overpriced on ebay.
If anything - go to DieselSite.com and get a better alternative from Bob!
Unless you have the tunes and the turbo that are actually putting out over 25+lbs of boost - this is not needed.
and if you are! i'd invest in ARP or h11 studs first - otherwise you'll loose a head gasket pretty quick.
The old big boost was just a small copper tube with a very small hole drilled in it to allow any pressure vented to the wastegate to not allow it to open...
Unplug it if thats what your going for.
As to being worried about studs at 25 psi...
There is no reason to worry about studs at 25, 30, 35 or even 40psi as long as you are using good tuning.
I could write a tune that would blow the heads right thru the hood at about 7psi... Its not about boost pressure (0-50 or more) but about cylinder pressures (which can exceed 2600psi...)...