on my 51 plymouth. i heated it up in the oven for about a half an hour then took them out and buzzed them up with some fluxcore with the mig gun, then tossed them back in the oven for a little longer. then i pulled them and shot them with some vht and then let them cool real slow in the oven. im also putting on a offy intake. just need to put it all back together over the next few days. then its back on the rack to do some exhaust work. right now it has a single with a glasspack, so when i add the second one i think im going to try it straight piped. if its to much i will toss on another glasspack or just order up a pair of porters.