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Stock or after market?

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Old Sep 6, 2013 | 01:53 PM
  #1  
Iroc Bob's Avatar
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From: Kentucky
Car: 1987 IROC Z28
Engine: L98 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.27
Stock or after market?

I have a 1987 IROC Z28 and I am interested in your thoughts on my exhaust system. I currently have the original muffler on it and I am considering an after market muffler. I am an older guy and do not want it to sound extremely loud. I think that the stock muffler sounds nice but I do not have any other experience with after market mufflers or the sound of them. Do you think that replacing the stock muffler will be a dramatic change or just be an unnecessary expense?

Thanks,
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Old Sep 6, 2013 | 02:13 PM
  #2  
carattini's Avatar
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From: North Carolina
Car: Pontiac 89 GTA
Engine: 350 TPI 5.7L V8
Re: Stock or after market?

If you like the way it sound it is an unnecesary expence. but if you are looking to have a better deep sound I sugest you put a set of headers and leave the rest like it is.
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Old Sep 6, 2013 | 09:30 PM
  #3  
Ron U.S.M.C.'s Avatar
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Stock or after market?

Go to YouTube and type in 1987 Camaro then the name of the muffler you want to here. Listen to a few and that should help you pick one out.
Heres the names of a few =
Flowmaster
Magnaflow
Borla
Dynomax
Hooker
Theres more but slip my mind at the moment.
Also the sound a car makes is IMO very important. After all it's a huge part of the cars make up. What you hear directly affects a person's impressions of the car.

This is an example of how much IMO changing the stock system to aftermarket will make a car sound meaner. This is a 3in cat back replacing stock. If you just do the mufflers it will have a slightly softer tone

.
Personally I’m a Flowmaster guy but that 80 series is probably too loud for him.


Last edited by Ron U.S.M.C.; Sep 6, 2013 at 10:37 PM.
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Old Sep 6, 2013 | 10:50 PM
  #4  
Ron U.S.M.C.'s Avatar
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Stock or after market?

Oh well I will post a video I found of a 3in. Flowmaster American Thunder cat back with the 80 series muffler like mine .I don't know what he did to his tips but mine came with 2 really nice 3in. stainless ones.

Last edited by Ron U.S.M.C.; Sep 6, 2013 at 10:54 PM.
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Old Sep 7, 2013 | 08:00 AM
  #5  
Iroc Bob's Avatar
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From: Kentucky
Car: 1987 IROC Z28
Engine: L98 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: Stock or after market?

Thanks for all the advice. I appreciate having a great community of experts to draw information from!
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Old Sep 7, 2013 | 11:23 PM
  #6  
83 Crossfire TA's Avatar
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Re: Stock or after market?

Originally Posted by Iroc Bob
Do you think that replacing the stock muffler will be a dramatic change or just be an unnecessary expense?,
Change in what, sound...probab.
. horse power, maybe.

Lol. Id bet most people on this board no idea what the stock exhaust sounded like... the early twin muffler setup sounded surprisingly agressive for a stock exhaust

If the car is basically stock then it doesn't matter much. Do what you like the sound of. An 80series flowmaster will make similar power to stock but sound very aggressive. Some better mufflers will make more power without getting that much louder. some of the later factory mufflers work very well. Running high 11's in the 1/4 I wasn't able to document any difference between a 4th gen stock muffler and a straight pipe
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Old Sep 9, 2013 | 05:30 PM
  #7  
GenX'Motorsport's Avatar
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From: Long Island NY
Car: 1989 Trans Am WS6
Engine: SBC+TPI+BOOST
Transmission: 700R4
Axle/Gears: Eaton 373
Re: Stock or after market?

Just get a stock replacment Magnaflow 3" kit. it has nice polished tips, and with a cat, its not too loud at all. Will give you some extra performance. And sounds GREAT when you nail it, Otherwise very docile. And its stainless steel, so you wont have to buy another one for a long time..
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Old Sep 9, 2013 | 06:27 PM
  #8  
Ron U.S.M.C.'s Avatar
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Joined: Apr 2006
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Stock or after market?

Originally Posted by GenX'Motorsport
Just get a stock replacment Magnaflow 3" kit. it has nice polished tips, and with a cat, its not too loud at all. Will give you some extra performance. And sounds GREAT when you nail it, Otherwise very docile. And its stainless steel, so you wont have to buy another one for a long time..


So far the only Magnaflow cat back for his car appears tohave 3in. pipe at the cat side (intake from the cat) so an adapter will have tobe used or he can consider a Magnaflow cat with a stock size intake and a 3in.output side so it will directly bolt on.

http://www.jegs.com/i/Magnaflow/642/...d=#moreDetails

Or he can just get the muffler and call it a day = http://www.summitracing.com/search/y...w?PageSize=100
I don't know what the exact stock inlet and out let size should be so some on else will have to figure that out and narrow down the selection in the link above.
Side note = You will not get the exact sound/tone of a full cat back.

Last edited by Ron U.S.M.C.; Sep 9, 2013 at 06:50 PM.
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Old Sep 9, 2013 | 06:46 PM
  #9  
GenX'Motorsport's Avatar
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From: Long Island NY
Car: 1989 Trans Am WS6
Engine: SBC+TPI+BOOST
Transmission: 700R4
Axle/Gears: Eaton 373
Re: Stock or after market?

Yup. Especially if its the original cat. Def replace it with a high flow unit. Chances are its pretty clogged up, and isnt flowing anyway it should be. Any high flow 3" will do. Magnaflow is a nice piece though, and would match the said catback perfect.
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Old Sep 9, 2013 | 06:50 PM
  #10  
Ron U.S.M.C.'s Avatar
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Joined: Apr 2006
Posts: 4,482
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Stock or after market?

Sorry......

Last edited by Ron U.S.M.C.; Sep 10, 2013 at 04:28 AM.
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Old Sep 9, 2013 | 06:52 PM
  #11  
Ron U.S.M.C.'s Avatar
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Joined: Apr 2006
Posts: 4,482
Likes: 10
From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: Stock or after market?

Sorry again....

Last edited by Ron U.S.M.C.; Sep 10, 2013 at 04:28 AM.
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Old Sep 9, 2013 | 06:57 PM
  #12  
paul_huryk's Avatar
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From: Ahead of you...
Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
Transmission: Level 10 700R4
Axle/Gears: Strange 12 bolt 3.42
Re: Stock or after market?

Originally Posted by GenX'Motorsport
Just get a stock replacment Magnaflow 3" kit. it has nice polished tips, and with a cat, its not too loud at all. Will give you some extra performance. And sounds GREAT when you nail it, Otherwise very docile. And its stainless steel, so you wont have to buy another one for a long time..
I was going to suggest the Magnaflow system as I have one on my GTA and love the sound, the fit, and the stainless construction. The only thing not to like (if you are picky) is the huge chrome tips off the muffler.

BTW, the list price is $510, Jeg's price is too high.
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Old Sep 10, 2013 | 04:30 AM
  #13  
Iroc Bob's Avatar
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Joined: Sep 2013
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From: Kentucky
Car: 1987 IROC Z28
Engine: L98 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: Stock or after market?

Great info! Thanks a bunch!
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