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should be as easy as sourcing the z06 exhaust components. both z06 and npp mufflers are 2.5". if need be, get a 3 to 2.5 reducer welded on inline and you are set......
If you can get a take off system from a Z06 for not much money, it would be a good mod (30 HP) . Most of the Z06 guys tend to keep their NPP mufflers, so you would just have a little exhaust work to connect the 3 inches Z06 H pipes to your 2 1/2 inch mufflers. If you got the complete systems from the manifolds to the mufflers, your NPP system should plug right into the Z06 NPP mufflers. The new ZR1 is using the same 3 inch system, so they must flow pretty well.