Hi guys i'm looking for some help for some problems i've got, i've just fitted a set a decats and i get a noise sorta like a washer vibrating and i've traced it to the cat sensors. The problem seems to be the thread isn't a tight fit into pipes and therefore seems to be causing the noise, i'm just wondering what i could put around the thread to tighten it up, i was thinking maybe some exhaust paste?? The second problem i have is a vibration/rattle sound which seems to be the exhaust vibrating on the underside of the car, i've had a good look but all the clearances seem spot on so was just wondering if anyone else has had this probem and how they managed to fix it?