I don't know the 2G suspension that well so I'll keep quiet on that topic but with regards to the turbo bolts backing out - get new OEM turbo bolts and new OEM turbo washers. They're super expensive (like $4-5/piece) and you need 2 for each bolt (so 8 total) but they work amazingly well. Never had a turbo bolt come loose with the OEM washers as they are concave/convex and you put them on in such a way that they essentially act like a heavy duty spring pushing out on the bolt and against the manifold, keeping everything snug and tight.