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There is a two bolt gasket between the mid pipe and the pipe that goes over the half shaft. You can use the original one if it's in good shape or else get one from the GM dealership, they are just a couple bucks. You can probably just get one from a parts store, I think it's 2 1/2" inside diameter but not entirely sure. Remember to get two of them, one for each side.
I haven't installed any B&Bs, but I see no reason why the stock flange gaskets wouldn't work. The stock gaskets (GM #10276792) list at $7.72 each, so you may want to check around for best price. Good luck.
yean, i told them to use stock gaskets,
but they said it won't fit...
so they are going to order some for me i guess..
hope it doesnt take too much outta my pcket
My Borla Stingers came with not only new gaskets, but a nice baseball cap as well. You'd think other manufacturers would at least supply you with new gaskets!