i currently have a magnex cat back exhaust system, when first fitted it was great but with it being a slide on system it never stays in place i wish id kept the exhaust standard now, even if it slides back a centimetre or 2 it really effects the cars performance all i can do is keep adjusting the exhaust and tightening the clamp up again its a nightmare, has anyone else had this stupid problem with these crap slide on efforts?