How much is this going to kill me performance wise? How long do you think it would take to do myself, and how much would it cost to have a shop remove the manifolds and then put all new bolts in?

What size are these bolts!!!???

 

performance wise ? a lot (usually enough to feel) do the repair yourself. pull a bolt and find 3 grade 8 bolts that match at the local hardware store (or go to pepboys and ask for manifold studs). then take off the manifold. if your lucky their will be a bit of the 2 broken ones sticking out . just grab them with pliers and take them out. if not get a drill and an easy out and have fun. sounds like they broke from fatigue from being loose. if so, whats left should come out easy. wile your there use locktite red on all the bolts when you put them back in , otherwise you'll be doing this again soon.

 

What does "grade 8" mean?

And I was thinking to use Anti-sieze on the threads instead of locktite...

 

TTT C'mon...

 

I believe that means strength of the bolt, like you can look on the back of it and see a star like pattern and some have 3 some have 5 in a star like pattern