Question on N-11 exhaust
Can anyone with an original N-11 exhaust system let me know if and are there embossed numbers on the mufflers. I have two sets of NOS n-11s one never on a car. The paper tag on the pipes and mufflers have the correct part # on the tag but the wrong embossed # on the muffler. I could be wrong but I thought I saw a set at Carlisle with the correct embossed # on the muffler. Thanks for any help in this. Greg
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Re: Question on N-11 exhaust
I am not sure about '66s, but I have an NOS system on my '64 and they have embossed part numbers on the mufflers, but the judging guide says they should not have numbers embossed if original. I have lost points for the numbers.Big Tanks In the High Mountains of New Mexico -
Re: Question on N-11 exhaust
I think you will find an "A" or "W" for the manufacturer of the exhaust on originals. Replacements are known to have p/n embossed.Comment
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Re: Question on N-11 exhaust
Michael, The judging guide I have says that the standard exhaust has no # on it, But the N-11 does have the # on it. The # on my NOS is 3845737 A on the left side with a part # ON THE PAPER TAG 3845735 and the right side just has A 113451 with # 3845736 ON THE PAPER TAG. I do not know what is correct. The Guide I have is the 5 edition for 1966 ThanksComment
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Re: Question on N-11 exhaust
Well then '66 is totally different than '64, my '64 TIM&JG says original mufflers had no embossed part numbers.Big Tanks In the High Mountains of New MexicoComment
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Re: Question on N-11 exhaust
There is an A on both of mine , but it is below the part # and above the second set of #s. What is it I have ?Comment
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Re: Question on N-11 exhaust
Oh, OK, I see your problem, the '66 TIM&JG says the N-11 mufflers have embossed part numbers, but it doesn't say what the part numbers are. Very strange they don't tell people what the part numbers are supposed to be on the mufflers, not sure why they do not know.Big Tanks In the High Mountains of New MexicoComment
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Re: Question on N-11 exhaust
There is NO DIFFERENCE between PRODUCTION and SERVICE N-11 mufflers assuming the PRODUCTION and SERVICE mufflers were manufactured about the same time. Of course, PRODUCTION use of the C2 N-11 mufflers ended in 1967 and the N-11 mufflers continued to be manufactured for SERVICE long after that. So, minor changes could have occurred.
The actual muffler component of the N-11 assemblies, which included both mufflers and rear pipes, was the same for both sides. As such, unless the part number was stamped on both sides of the muffler (and I don't think it ever was) only one side would evidence a part number stamped on the bottom, in a visible location when installed on the car.In Appreciation of John HinckleyComment
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Re: Question on N-11 exhaust
Joe, Thanks for the reply. I think I read years ago you posted that the original N-11 had a different sound that would not be the same as the service mufflers after 1967. Do you or anybody else have any experance with this you could share. I have one set from mid 90s and another not on the car from I don't know when. The part # on the one muffler and only one muffler like you stated is not what the JG says for original.Any Thoughts. Thank's againComment
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Re: Question on N-11 exhaust
Greg------
I don't think I ever said that the sound produced by GM SERVICE N-11 mufflers was different than those used in PRODUCTION. My expectation would be that the sound would be identical since the construction of the mufflers was absolutely identical for both. What I did once say was that the sound produced by REPRODUCTION N-11 (or, any other Corvette muffler, for that matter) was different than that produced by the GM mufflers, PRODUCTION or SERVICE. That's because the construction of reproduction mufflers including, as far as I know, those manufactured under the GM Restoration Parts Program, is different.
As far as the embossments on the shell of the muffler, it's very possible that that changed over the years. That's the sort of nuance I don't get too involved in.In Appreciation of John HinckleyComment
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Re: Question on N-11 exhaust
Wayne------
Which side muffler is this? The part number would be the actual part number for the left side muffler assembly. However, the part number on both of the left side NOS N-11 assemblies I have [none for sale] is 3845737 which is not the part number for EITHER the right or left assembly. I always assumed this was the part number for the muffler component of the assemblies. My right side assemblies are too hard for me to get at but my recollection is that the number is the same. What number is on the other muffler you have?In Appreciation of John HinckleyComment
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Re: Question on N-11 exhaust
Joe, This is now starting to make sense. The one set I have has a date on the paper tag of 11-01 and the # on the left muffler is 3845737 . The right side does not have this number on the muffler. The same set I have on the car just does not sound like the original N-11. But maybe they were not original after all. The #s Wayne showed I have seen on older exhaust.Comment
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Re: Question on N-11 exhaust
Greg-----
Are you sure the right side is GM? Does it have any embossings indicating a GM muffler?
In any event, I do not think there was any difference in the construction of the original PRODUCTION N-11 system and the very last ones sold in SERVICE by GM. So, if both of your mufflers are GM, they should sound exactly like they did back in the 60's.In Appreciation of John HinckleyComment
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Re: Question on N-11 exhaust
Joe, The right side muffler has
GM
A
11 345 1
Embossed on both sides and the GM paper tag on the pipe has #3845736 for a part number on both sets I haveComment
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