i slapped my buddies mbc on my car just cuz,lol and it's the turboxs one, and it's weird, there's the 2 sides where the vacuum lines go, the screw to adjust the boost, and then the weird part is, the top of the body itself can be screwed tighter or looser. i was wondering if that does anything and if so, what that would be

 

The top is how your supposed adjust the boost. Im not sure what this screw your talking about is

 

So is it the same as a regular one, were when its open all the way its running the least amount of boost and when its shut all the way its running the most boost?

 

Ha I just saw it says plus and minus