Yes, go with grade 8 bolts, not the ones from the dealer. You can find them on ebay. If I were you, I would buy the bolts, then use one to see if you can put in in that rear hole and tighten it down. Often, the rear bolt just falls out. If you cant get it to go in (because the bolt broke off in the head), then that $150 is well spent. Having taken off manifolds to replace with headers, and extracting broken bolts, getting that done for that price is a no-brainer. The factory gasket is the best out there for a stock manifold (layered steel).
If they tell you they need to replace the head, just leave. Any good tech can get a broken bolt out, even if they need to weld a nut on it to back it out.
Just so you know what they have to do:
- remove all bolts (hard to get at)
- remove cat
- drill/extract broken bolt
Get them to cut out the spacer bar on the manifold when they are at it. There is a TSB on it that they can check. Cutting out the spacer makes the manifold less likely to crack. Check the manifold on the bottom. See how there is a bar between the front but not the back? It has been cut. If you buy aftermarket, they now come pre-cut.
