I trying to identify a used underbody welded exhaust pipe/muffler assembly system I have. The configuration is such that it fits a midyear. The pipes are flatten and the muffler has a single bracket welded on the back which is appropriated located for the midyear application. The one muffler has the following information in raised alphanumerics on the bottom surface 1 1 014 6 A and INLET located below the alphanumerics. The other muffler has 4 1 022 5 A on it. Is it a GM system? Any help in identifying the assemblies will be appreciated. Pete
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Re: Exhaust/Muffler Assembly Identification
Peter-----
Unfortunately, GM SERVICE mufflers were configured in numerous different ways with respect to markings. Often times, "GM" will be found debossed somewhere upon them. But, NOT always. Sometimes, a part number will be debossed. But, NOT always. One thing that I have seen on every GM SERVICE muffler, though, is the manufacturers code----a debossed "W" (for Walker) or an "A" (for Arvin). The particular coding sequence which you described I have not seen on a GM SERVICE or PRODUCTION muffler. However, as I say, there were so many variations that it could well be one of those that I've not seen previously. I still think that there should be a "W" or an "A", though, if it's an original GM SERVICE muffler.
One other thing: the fact that you have the word "inlet" debossed on the muffler makes me suspicious that it's an aftermarket muffler. Aftermarket mufflers are usually made up from one of several "standardized" mufflers with different pipes welded on either end to fit the specific application that they're intended for. OEM mufflers are completely application-specific. In any event, the word "inlet" is often debossed on the case of the "standardized" aftermarket mufflers for those finished applications where the pipe configuration does not make it intuitive as to which end is which AND as a manufacturing aid.In Appreciation of John Hinckley -
Re: Exhaust/Muffler Assembly Identification
Peter-----
Unfortunately, GM SERVICE mufflers were configured in numerous different ways with respect to markings. Often times, "GM" will be found debossed somewhere upon them. But, NOT always. Sometimes, a part number will be debossed. But, NOT always. One thing that I have seen on every GM SERVICE muffler, though, is the manufacturers code----a debossed "W" (for Walker) or an "A" (for Arvin). The particular coding sequence which you described I have not seen on a GM SERVICE or PRODUCTION muffler. However, as I say, there were so many variations that it could well be one of those that I've not seen previously. I still think that there should be a "W" or an "A", though, if it's an original GM SERVICE muffler.
One other thing: the fact that you have the word "inlet" debossed on the muffler makes me suspicious that it's an aftermarket muffler. Aftermarket mufflers are usually made up from one of several "standardized" mufflers with different pipes welded on either end to fit the specific application that they're intended for. OEM mufflers are completely application-specific. In any event, the word "inlet" is often debossed on the case of the "standardized" aftermarket mufflers for those finished applications where the pipe configuration does not make it intuitive as to which end is which AND as a manufacturing aid.In Appreciation of John HinckleyComment
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Re: Exhaust/Muffler Assembly Identification
Joe - Thanks for the information. Both mufflers do have the A at the end of the alpha numeric string, so perhaps they are GM then again maybe not. Thanks again, PeteComment
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Re: Exhaust/Muffler Assembly Identification
Joe - Thanks for the information. Both mufflers do have the A at the end of the alpha numeric string, so perhaps they are GM then again maybe not. Thanks again, PeteComment
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