If you use the 3" X 14" Goerlich's and you want a deep loud sound, you won't be disappointed. The X-Pipe will tone it down a bit, but the cars I've heard with those pipes and the shorter case Goerlich's have been very aggressive sounding. It's hard to describe the difference, but it's not as tinny as the flowmasters sound. More like a pro-stock type of sound to me. Try the sound clips of the Goerlich's on this site. Here's the link and there is one on the right with a '67 Lemans with the 3" X 14" Goerlich's.
http://www.pypesexhaust.com/sounds-gm-abody.html
Good luck on it, Rick
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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