Hi Karan, we are trying to find a new supplier of the genuine Nissan ones, these shouldn't cause you problems unless the nut's/studs are coming loose, which is entirely possible with the vibration caused by the bee-r. This is one of the reasons that I removed my Bee-r, as I couldn't keep the exhaust system together .
Just a wild shot really, are these gaskets in stock for the CA engine and stock T25 elbow? Also the elbow to downpipe ones. Please tell me yes as will need to collect one of each asap