I have two pairs of these adapters for use with a pair of Walker catalytic converters that have 3" inlets and 3" outlets where they fit perfectly. The transducers were then placed between a set of equal length, Hooker-tuned competition heads and a set of Purple Hornies fitted to a modified 1991 Camaro Z28. We will have an amazing sound! These adapters have a very good, even weld around the tube and flange and are painted matte black to prevent rust. The outside diameter is exactly 3" and the length is exactly 4" from the end of the flange.
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