hello all firstly ive got some questions about my t love the car but not a fan of the allo heads really but anyway ive had the car for 2 years now rarely drive it probably 100ks a month if its lucky as I have the work cruiser now im no mechanic but im not dumb with engines but under boost the car seems to die down its almost sputtering fulttering sound but its not a turbo flutter im wondering if anyone else has had a problem like this? I tensioned all the manifold bolts up but the turbo was missing 1 bolts and stud completely but 3 where tight as a nuns c**t I went to fraud and asked for a stud and nut they said they would have to order it over night but I didnt have time so I asked them for the bolts type they looked at me like a stunned parrot so I walked out in disgust but do you think that would be the problem? the car has 125k on the clock (previous owner) I service it myself it has new everything filter wise always runs premium also another problem I have is a knock I know the diff mountings are weak but this is a sound like a cv joint on a front wheel drive car makes a very well defined knock it comes and goes ive hoisted the car up and tryed to find anything loose to no help anyway any ideas will be welcomed btw the car is unmodified