Trying to fix a pesky code. PO171. I had new cats welded in, but my Indy is determined that there is no way the muffler shop properly welded those cats in without removing the exhaust.

So, I am removing the exhaust. I hope my Indy is right.

Started the fun and broke two bolts at the flange to the manifold.

Does anyone know what the part number is for those bolts and any tips for removing the exhaust?