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Another reply to DoctorWill might be that if the materials are correctly selected exhaust heat is your friend. In a performance exhaust the speed...
From a performance stand point I can't see why there's so much interest in the 4-2-1 manifolds or "Tri-Y" as they were called when developed for...
This has been a very interesting discussion but potentially damaging to some suppliers who believe that their products are designed & manufactured...