what do you guys think

hey jd. thanks for the reply. i wasnt sure about support places on exhaust systems. my motor mounts are all new and the motor doesnt really move around much. its the gaskets at the collectors that both blew. what type of bolts/nuts should they use on an exhaust. he used 5/16 bolts with double nuts on the back side on one header. no lock washers or anything. and on the other header just bolts and one nut on the back side. that one blew out first. and the other header after.