exhaust leak after going WOT, but goes away after restart 10 minutes later..

[The Darkside]

I just installed a set of Poston headers using remflex gaskets a few days ago. I went out tonight to test it a little bit at wot & when I went WOT the car kinda bogged/cut out( the exhaust sounded like it had a bad leak)) so I got out of it & coasted to the next exit....When I stopped at the stop signI had a very noticable exhaust leak, so pulled into a gas station & shut it off....Waited about 10 minutes & restarted the car & the exhaust leak was gone!! Anyone ever experience this? Do I need to just retighten the headers up some more? They are torqued at around 14lbs now....

The Darkside

 

[The Darkside]

Problem solved.....turned out to be the poston 2 piece crossover leaking where it slides together...tack welded & heavier clamp now!!!