Slobird,
To offer another answer to your original question, the X tends to smooth out the sound. In my opinion, it makes Pontiacs sound less like Pontiac/Buick/Old engines and more like higher winding Chevrolets. In every case we have used or seen one being used, they tended to get rid of the raspiness and choppiness and mellow the sound. Even on cars with Flowmasters that were sort of crackly, the X tended to make the sound less so. Many factors will control the sound, like compression and camshaft timing, etc., but mufflers will have a big impact. What sort of mufflers were you thinking about? We have many that have been tested over the last few years and maybe I can tell you which will do what. You are most welcome to borrow anything I might have that will fit or I can research the ones you are thinking about and see what others have experienced.
Tom Hand
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Tom Hand
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