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Swedish treasures wrote me back that their St.St. exhaust is all stock diameter and components (includes pre and post mufflers). They didn't say if bends were mandrel. Also said that B20E manifolds are prefered.
So now I'm thinking I'll line up a B20E exhaust manifold, and get a custom made carbon steel pipe 2-1/4" or 2-1/2" dia. with mandrel bends. The st.st. seems like a nice idea but pretty pricey and since I do live in Calif. corrosion is not so much a problem. Probably cost around $400-$500 installed.
I'm partial to Flowmaster mufflers which I believe flow well, and I know they sound good.
Later,
Al
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