9sec, sorry for the late reply, this one was farther down the string and I missed it.
I saw you mentioned the UltraFlo ovals on another string and they too are great choices. All of the straight through mufflers (Magnaflow, Goerlich's, UltraFlo and Straightline Performance) act about the same. Offset-offset changes the flow somewhat but I assume you'll be using the straight through ones anyway.
You ask what I thought of their mufflers; I think you mean the Spin Techs? We never got to test the bigger 3.0" diameter ones at the track. Sound wise, they were pretty loud.
Tom Hand
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Tom Hand
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