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If you look at the exploded view on a parts website for the parts in the recall, you can see that item 25958410 (which is added in the recall) appears to have two cats on it, which are not present on my 09 C6. So unless those are resonators or something, they've got to be cats.
Here is the recall document I was given. Maybe I'm missing it but I don't see the part number to make the 08/09 c6 have a total of 4 cats. I see that they're replacing the two original cats but not replacing two and adding two more.
Edit: Per GM part#25958410 has 2 cats on it.
Interesting to see that Pt# 25958410 (Underbody converters, 2009 only) is stated on that sheet. So does that imply 2008's will not get the underbody converters, but just the 2 replacements by the exhaust manifolds?
I just had my 2009 Corvette refitted with the new converters at Tom Bell Chevrolet in Redlands, and the performance seems unchanged. Whatever the reprogram did had no effect on performance as far as I can tell. It goes from 60 to 130 as fast as ever...lol.
I only have 16000 miles on the car. We shall see if there are any other issues.
The parts listing and so forth makes it sound as if they replaced the converter with a "PIPE", but surely that con't be so! They can't be eliminating the converter completely. Must just be an oddity in the part name.
By the way, the "Voluntary Recall" designation is misleading; it is definitely Required for these cars by the State of California. The dealer told me that if you don't have the converters replaced you will automatically be considered "out of compliance" the next time you need to get a smog check.
I just had my 2009 Corvette refitted with the new converters at Tom Bell Chevrolet in Redlands, and the performance seems unchanged. Whatever the reprogram did had no effect on performance as far as I can tell. It goes from 60 to 130 as fast as ever...lol.
I only have 16000 miles on the car. We shall see if there are any other issues.
The parts listing and so forth makes it sound as if they replaced the converter with a "PIPE", but surely that con't be so! They can't be eliminating the converter completely. Must just be an oddity in the part name.
By the way, the "Voluntary Recall" designation is misleading; it is definitely Required for these cars by the State of California. The dealer told me that if you don't have the converters replaced you will automatically be considered "out of compliance" the next time you need to get a smog check.
NO! The two part #'s ending in 404 and 405 are the left side and right side converter with pipe. This is directly connected to the exhaust manifolds. The mid "H pipe" #410 has two converters attached as one part #.
The million dollar question is: Who had the recall and have physically seen the mid "H pipe" with no converters?
Last edited by Mike's LS3; 06-04-2015 at 11:11 AM.
NO! The two part #'s ending in 404 and 405 are the left side and right side converter with pipe. This is directly connected to the exhaust manifolds. The mid "H pipe" #410 has two converters attached as one part #.
The million dollar question is: Who had the recall and have physically seen the mid "H pipe" with no converters?
I'm not sure what you mean by "who had the recall?".
The recall seems to have been initiated by the California Air Resources Board, if that is what you mean.
The part numbers that were installed by my dealer were 25958404, 25958405, 25958410, 21992620 and 12555555.
It appears that 404 and 405 are the converters and 410 is some sort of connector pipe (not a converter).
Models: 2008-2009 Chevrolet Corvette Equipped with 6.2L Engine (LS3) and California Emission System (NU5)
General Motors has decided to conduct a Voluntary Emissions Recall involving certain 2008-2009 model year Chevrolet Corvette vehicles, equipped with a 6.2L engine (LS3) and California Emission System (NU5). The vehicles may be emitting air pollutants in excess of the California vehicle emission standards.
Parts Information: Parts required to complete this recall are
Part Number
Description
Quantity/Vehicle
25958404
Pipe, Catalytic Converter (Left)
1
25958405
Pipe, Catalytic Converter (Right)
1
25958410
Pipe (Underbody Converters, 2009 Only)
1
21992620
Gasket, Exhaust Manifold Pipe
2
12555555
Seal, Exhaust Manifold Pipe
2
Has anyone looked under their car after they had the recall done
I'm not sure what you mean by "who had the recall?".
The recall seems to have been initiated by the California Air Resources Board, if that is what you mean.
The part numbers that were installed by my dealer were 25958404, 25958405, 25958410, 21992620 and 12555555.
It appears that 404 and 405 are the converters and 410 is some sort of connector pipe (not a converter).
wa6itd
I am referring to those who had the recall performed on their car. If they physically have seen the "mid H or X pip" that was installed part#25958410 that included the additional cats. Not the cats by the exhaust manifolds up by the engine, but under the car near the floor boards. Like the photo above in post #110 for 2012 and later C6's. Interesting to note that part #25958410 states "2009 only". I wonder if the 2008's will not need the additional cats?
Like "Dif" asked: "Has anyone look under their car after the recall was done?"
Last edited by Mike's LS3; 06-04-2015 at 07:03 PM.
I am referring to those who had the recall performed on their car. If they physically have seen the "mid H or X pip" that was installed part#25958410 that included the additional cats. Not the cats by the exhaust manifolds up by the engine, but under the car near the floor boards. Like the photo above in post #110 for 2012 and later C6's. Interesting to note that part #25958410 states "2009 only". I wonder if the 2008's will not need the additional cats?
Like "Dif" asked: "Has anyone look under their car after the recall was done?"
Having mine done tomorrow and I'll report back. Also, curious to see if my NPP exhaust will be muted as someone posted earlier.
So I had the recall done last week on my 09 and took some pictures with the car on the ground. Pretty sure the arrows are pointing to the "new" cats in the H-Pipe.
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So I had the recall done last week on my 09 and took some pictures with the car on the ground. Pretty sure the arrows are pointing to the "new" cats in the H-Pipe.
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I'll be leaving for dealership in a few to have the cats put on. Did you notice a difference in exhaust note particularly if you have the NPP system?
My 2009 came with two cats up by the headers. The new pipes have two more back by the H-Pipe mid car. My service writer informed me my car had been altered and was missing two cats. Told him nope that's the factory exhaust so the 2009 only came with two large ones up front. The recall adds two more small ones down stream on the exhaust system.
My 2009 came with two cats up by the headers. The new pipes have two more back by the H-Pipe mid car. My service writer informed me my car had been altered and was missing two cats. Told him nope that's the factory exhaust so the 2009 only came with two large ones up front. The recall adds two more small ones down stream on the exhaust system.
-George
Are you able to answer my question posted above this one?
So does anybody know for sure if the new mid pipe with the 2 cats is an "X" pipe or an "H" pipe? The reason I ask is I have Corsa Extreme's on my car and I have heard often that you get less drone with the "X" pipe. Thanks.
No, car still sounds the same. I brought it in with the NPP turned off and when I got it back it was on and the window indexing was also kaput and I had to re-index them but that could have been due to the fact I also had the low beam headlight recall fix done so they probably disconnected the battery when fiddling with the wiring for that fix. Like I said above I picked up 5-6 mpg on the 100 mile trip home vs. what I was getting going to the dealer that morning. Back to what the car got when new, upper 20's in mpg on the highway instead of low to mid 20's.
So does anybody know for sure if the new mid pipe with the 2 cats is an "X" pipe or an "H" pipe? The reason I ask is I have Corsa Extreme's on my car and I have heard often that you get less drone with the "X" pipe. Thanks.
Charlie
Pictures above look like the preferable "X" pipe. Some good news.
"Walt White Coupe" thanks for posting the picture. That answers my question.
05-30-2015, 11:05 AM
