True duals with cats and over the axle exit will not be cheap and you want to find a shop that can do quality work so there are no rattles. Most shops use benders that will kin the pipes so any gain you might thing you'll pick up over a 3" single will be lost right there. I think Bassani sells a true dual setup but it's not cheap. I don't think it's worth the cost or hassle just to say I have true duals(and I have a 3" true dual setup on my SS396). Definitely research it and ask the shops if they mandrel bend the pipes or not.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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