Which cars got the SLP dual dual catback?
05-02-2011 | 08:05 PM
#1
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On The Tree
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From: Annapolis, MD
Which cars got the SLP dual dual catback? I picked up a '99 SS last week, completely stock. The interesting thing is that the exhaust, though quiet, has a sigificantly deeper sound inside the car than the hooker catback I have on my '02 TA. Honestly, I think the deeper tone sounds better than the hooker IMO.
It doesn't have the dual tips, though; just single rolled tips. So could this be a dual/dual with different tips? Is it just the regular catback(not sure if that year got the dual/dual by default or not)? Is there any well to tell for sure looking at the muffler or piping?
Either way, it sounds better than the stock catback on the TA did. The hooker is louder outside the car but I guess I forgot that it isn't much louder than stock.
It doesn't have the dual tips, though; just single rolled tips. So could this be a dual/dual with different tips? Is it just the regular catback(not sure if that year got the dual/dual by default or not)? Is there any well to tell for sure looking at the muffler or piping?
Either way, it sounds better than the stock catback on the TA did. The hooker is louder outside the car but I guess I forgot that it isn't much louder than stock.
05-03-2011 | 01:08 AM
#2
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From: Schiller Park, IL Member: #317
Sounds like the tips are stock (standard SS/WS6, non-dual/dual issue), but that doesn't mean that the muffler is. Many people have done muffler swaps on these cars at this point, while leaving the tips stock.
If you are unable to identify the muffler, you could take a pic and post it here. I'm sure we could help you identify it, or at least determine if it's stock or not.
PS. Dual/dual was never standard issue on any year SS, it was an additional option (would have required RPO Y2Y). It was, however, the standard muffler on Firehawks.
If you are unable to identify the muffler, you could take a pic and post it here. I'm sure we could help you identify it, or at least determine if it's stock or not.
PS. Dual/dual was never standard issue on any year SS, it was an additional option (would have required RPO Y2Y). It was, however, the standard muffler on Firehawks.
05-03-2011 | 03:04 PM
#4
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From: Schiller Park, IL Member: #317
There is no specific RPO code that directly indicates the dual/dual system.
05-03-2011 | 03:25 PM
#5
Formally Simplɘ Jack
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From: Chicago
My '00 SS came with the SLP Dual/Dual and it sounds sick imo, low key at idle and a demon at WOT. I actually decided to stay with the catback and get headers/ory in the future with it. My SLP sticker on the passenger door is faded so hard to read, so you can call SLP and give them your vin number and they'll tell you everything the car came with if you have the same issue. '98-'00 came with the SLP DD option.
Last edited by BoricuaHec01; 05-03-2011 at 03:39 PM.
05-03-2011 | 05:08 PM
#7
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From: Schiller Park, IL Member: #317
Dual/dual was avaliable as an option all the way through 2002. 
Correct. You are now only a 99.5% complete newb. 
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05-03-2011 | 05:10 PM
#8
Formally Simplɘ Jack
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From: Chicago
And tell your boy to take that rank off, it's killing my rep lol. 
05-03-2011 | 07:55 PM
#12
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On The Tree
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From: Annapolis, MD
Well apparently its not completely stock. Sounds great inside, but I could go for something louder to be honest ..it's pretty tame outside.
If its a flowmaster, which don't flow so well, I might picking up a TSP Rumbler...lol
If its a flowmaster, which don't flow so well, I might picking up a TSP Rumbler...lol
Last edited by StreetLethal; 05-03-2011 at 08:30 PM.
05-03-2011 | 09:54 PM
#13
I may be wrong but I believe there were 3 stock catbacks...a regular one that came on the base cars (Z28, Formula, Trans Am), the one you have (which came stock on the SS and WS6), and the Dual Dual which came stock on the Firehawk. I'm pretty sure the one you have has slightly bigger piping than a regular factory catback and has a slightly different sound.
05-03-2011 | 10:41 PM
#14
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From: Annapolis, MD
On a side note, how loud is the TSP rumbler on stock manifolds and cats? I've listened to the clips and like the sound but I want to make sure that its loud enough. I was a bit dissappointed the first time I started my TA up after putting the Hooker catback in.
05-03-2011 | 11:53 PM
#16
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From: Schiller Park, IL Member: #317
I think some of you guys have never seen a Flowmaster muffler before. 
There is zero chance that the muffler shown in that pic is a Flowmaster.
That pic shows what looks to be the stock SS/WS6 muffler from GM, complete with the factory seams and weep hole visable in the muffler, as well as the factory tailpipes & tips.
If the car is louder than other stock cars, then the cats may have been gutted at some point.
In this instance, the Y2Y code did not apply to the exhaust (unless someone swapped the dual/dual for a base SS/WS6 catback, prior to selling the car).
All correct. But the dual/dual that came stock on the Firehawk was also optional on the SS. Keep in mind that there was also one other catback, used only in 1998 on the SS/WS6 (single outlet on driver's side...this was a GM catback).
The base SS/WS6 catback (show in this thread) included the same 2.75" I-pipe as the Z28/Formula/Trans Am, but has larger 2.5" tailpipes (base V8 models received 2.25" tailpipes).
There is zero chance that the muffler shown in that pic is a Flowmaster.That pic shows what looks to be the stock SS/WS6 muffler from GM, complete with the factory seams and weep hole visable in the muffler, as well as the factory tailpipes & tips.
If the car is louder than other stock cars, then the cats may have been gutted at some point.
In this instance, the Y2Y code did not apply to the exhaust (unless someone swapped the dual/dual for a base SS/WS6 catback, prior to selling the car).
The base SS/WS6 catback (show in this thread) included the same 2.75" I-pipe as the Z28/Formula/Trans Am, but has larger 2.5" tailpipes (base V8 models received 2.25" tailpipes).
05-04-2011 | 09:52 AM
#17
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From: Annapolis, MD
Yeah, I noticed that the outlet pipes were 2.5". It has a surprisingly good tone for stock compared to the base TA muffler. Does the TSP Rumbler have a pretty deep tone? I don't care about a little rasp, I just don't want anything that sounds like a machine gun or has lots of popping when rpms drop.
05-04-2011 | 11:30 AM
#18
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From: Maryland
I think some of you guys have never seen a Flowmaster muffler before. There is zero chance that the muffler shown in that pic is a Flowmaster.
That pic shows what looks to be the stock SS/WS6 muffler from GM, complete with the factory seams and weep hole visable in the muffler, as well as the factory tailpipes & tips.
If the car is louder than other stock cars, then the cats may have been gutted at some point.
In this instance, the Y2Y code did not apply to the exhaust (unless someone swapped the dual/dual for a base SS/WS6 catback, prior to selling the car).
All correct. But the dual/dual that came stock on the Firehawk was also optional on the SS. Keep in mind that there was also one other catback, used only in 1998 on the SS/WS6 (single outlet on driver's side...this was a GM catback).
The base SS/WS6 catback (show in this thread) included the same 2.75" I-pipe as the Z28/Formula/Trans Am, but has larger 2.5" tailpipes (base V8 models received 2.25" tailpipes).
There is zero chance that the muffler shown in that pic is a Flowmaster.That pic shows what looks to be the stock SS/WS6 muffler from GM, complete with the factory seams and weep hole visable in the muffler, as well as the factory tailpipes & tips.
If the car is louder than other stock cars, then the cats may have been gutted at some point.
In this instance, the Y2Y code did not apply to the exhaust (unless someone swapped the dual/dual for a base SS/WS6 catback, prior to selling the car).
All correct. But the dual/dual that came stock on the Firehawk was also optional on the SS. Keep in mind that there was also one other catback, used only in 1998 on the SS/WS6 (single outlet on driver's side...this was a GM catback).
The base SS/WS6 catback (show in this thread) included the same 2.75" I-pipe as the Z28/Formula/Trans Am, but has larger 2.5" tailpipes (base V8 models received 2.25" tailpipes).
Being a new SS owner myself (got it last week) I have one quick question I would like to ask. Is there a flange or piece or something that I or someone else could actually literally get under the car and look at to tell whether or not the muffler is stock or not? My car has the stock exhaust tips, stock headers etc., bone stock down to the lid. But it just sounds unusually throaty which is why I'm asking.
(Sorry for the little thread jack OP)
05-04-2011 | 01:08 PM
#19
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From: Schiller Park, IL Member: #317
Yeah, I noticed that the outlet pipes were 2.5". It has a surprisingly good tone for stock compared to the base TA muffler. Does the TSP Rumbler have a pretty deep tone? I don't care about a little rasp, I just don't want anything that sounds like a machine gun or has lots of popping when rpms drop.
Very helpful and informative post, you covered a lot of points that I myself have been wondering.
Being a new SS owner myself (got it last week) I have one quick question I would like to ask. Is there a flange or piece or something that I or someone else could actually literally get under the car and look at to tell whether or not the muffler is stock or not? My car has the stock exhaust tips, stock headers etc., bone stock down to the lid. But it just sounds unusually throaty which is why I'm asking.
(Sorry for the little thread jack OP)
Being a new SS owner myself (got it last week) I have one quick question I would like to ask. Is there a flange or piece or something that I or someone else could actually literally get under the car and look at to tell whether or not the muffler is stock or not? My car has the stock exhaust tips, stock headers etc., bone stock down to the lid. But it just sounds unusually throaty which is why I'm asking.
(Sorry for the little thread jack OP)
GM
997144
A
511190
That is for a '99-'02 SS/WS6 muffler.
And like I mentioned before, if the car seems noticeably louder than other stock LS1s with the same exhaust, then it's possibile that the cats may have been gutted at some point.
05-04-2011 | 03:01 PM
#20
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From: Maryland
Rasp shouldn't be an issue if you still have cats. Some degree of popping when you let off the gas under certain conditions is normal for a high flow exhaust system though.
Well, you can use the picture in this thread for reference as to what the stock SS/WS6 muffler looks like. I'm not sure what the condition of your muffler is, but here are the factory stampings that you should be able to see on the bottom of the muffler case (when looking up from under the car):
GM
997144
A
511190
That is for a '99-'02 SS/WS6 muffler.
And like I mentioned before, if the car seems noticeably louder than other stock LS1s with the same exhaust, then it's possibile that the cats may have been gutted at some point.
Well, you can use the picture in this thread for reference as to what the stock SS/WS6 muffler looks like. I'm not sure what the condition of your muffler is, but here are the factory stampings that you should be able to see on the bottom of the muffler case (when looking up from under the car):
GM
997144
A
511190
That is for a '99-'02 SS/WS6 muffler.
And like I mentioned before, if the car seems noticeably louder than other stock LS1s with the same exhaust, then it's possibile that the cats may have been gutted at some point.
I just checked under the car and it is the stock muffler, the cat's are still there as well, I'm positive. I guess they just sound like this stock, I don't remember my Dad's stock '02 WS6 being as throaty as this SS but whatever, I'm not complaining!
Thanks again for the help!