Is there a sound difference between the Ulta Flo SS and Ultra Flow Welded mufflers if you buy the same size for each? Or is the only difference between the two the material the case is made out of (steel vs. stainless steel)?
Per the Dynomax website, the ulta flow ss's have a $75 rebate too!
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'69 Silver GTO Convt (400/M20/3.55)
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