The Gardner systems are an exact duplicate of the original ones - with the same original flow restrictions and all.
If you are looking for performance, go aftermarket like a Pypes system. If you are going for restoration go Gardner.
I have had the Gardner systems on two 455HO 1972 Formulas and they looked perfect on a full restration but I went with a Pypes crossflow on my Gramma's car with their new 2-1/2" Ram Air D-port manifolds, and that exhaust completely out performs the stock/Gardner system in terms of performance.
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