I went to tighten my jpipe nuts, and 2 of them just completely fell out while on the stud and they wont go back into the flange for the precats... wtf do I do lol ive got a sweet exhaust leak now. if I stripped the flange how would I tighten it up?

 

Any pics?

OEM primary cats?

The studs are replaceable, but you'll probably have to pull the cat.

 

I have new studs its just they wont screw into the flanged part. And yea oem cats.