I had to replace the gasket (#16318) for my RB NT down-pipe... didn't wanna pay $10.00 + shipping + waiting for it to arrive.

Carquest has one that'll work! Mfg part # GSK F5561K and it's only $2.49 (+ tax of course)!!
-its gotta be "finessed" over the studs on the OEM collector but it works! (hey, at least it won't fall off while reattaching the down-pipe)

 

Its probably not made out of the same material and will burn up eventually.

 

Oh, you mean like the RB gasket that burned up?!