sorry to hijack your post but does anyone know how you'd find out if your revision D could be leaking? I took mine off yesterday to inspect as I was sort of wanting to find a split revision G, turns out to be a D. I only checked as my car seems to have an inconsistent boost but under load makes a sort of whistle/squeak. don't know wether to just change for a G and hope it cures. Car also has a k&n typhoon but all joints appear solid
