a while back i had to pull of the remaining californian emission piping, it had already been cut and was just useless pipe sitting there, to put on some new headers. We didn't know how to plug the holes so we cut down the piping and attached bolt heads so that we could plug the holes. Well i guess we didn;t get one on good enough so it broke off, so was driving with a 1/8 inch hole right before my headers[:@]. So my question is what do guys use to plug theses holes, once i get the bolt with no head out, i would rather pull out our shotty plugs if there is something better out there. thanks for the help

 

Mine has had them plugged since the 70's with just regular bolts.