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The beginnings of my 3” dual exhaust

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Old Jun 10, 2018 | 09:29 PM
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Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
The beginnings of my 3” dual exhaust

Transmission cross member


Header pipes


Dual MagnaFlows


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Old Jun 14, 2018 | 12:42 PM
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Re: The beginnings of my 3” dual exhaust

Looks sweet so far! Can't wait to see the final product!
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Old Jun 14, 2018 | 09:42 PM
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Re: The beginnings of my 3” dual exhaust

Thats sweet work going on there!!!
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Old Jul 13, 2018 | 11:13 AM
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Re: The beginnings of my 3” dual exhaust

Very nice fab work!...but why dual 3"?
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Old Jul 15, 2018 | 10:41 AM
  #5  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

The car has a 600+ hp 408 ci LS2 that I didn’t want to choke off.
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Old Jul 15, 2018 | 11:01 AM
  #6  
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Re: The beginnings of my 3” dual exhaust

I look forward to the finished pics and a video to hear it.
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Old Jul 15, 2018 | 12:08 PM
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Re: The beginnings of my 3” dual exhaust

Where will you exit?
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Old Jul 15, 2018 | 06:01 PM
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

This car also has a full Corvette suspension, the exhaust will run the length of the transmission tunnel along the driveshaft, under the differential, and exit the center below the license plate. I want to redesign the rear bumper with a diffuser, but that’s for another thread.
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Old Mar 24, 2019 | 09:17 PM
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

I made some progress today, now I have a few hours of welding ahead.





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Old May 28, 2019 | 10:12 PM
  #10  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

Tail pipes finished









I need to adjust the length and add tips, then it’s all off to be ceramic coated.
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Old May 29, 2019 | 04:26 PM
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Re: The beginnings of my 3” dual exhaust

jealous of the Syncrowave in the background
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Old May 29, 2019 | 07:23 PM
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Re: The beginnings of my 3” dual exhaust

Aren't you worried it's going to be too quiet?
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Old May 29, 2019 | 09:58 PM
  #13  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

Yeah, I have to be considerate of my neighbors. Imagine starting it up at 3 am when I head off to work.
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Old Jun 1, 2019 | 05:54 PM
  #14  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

Exhaust system heading off to be ceramic coated. I will post more pictures when it comes back and some with the system installed.

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Old Jun 13, 2019 | 07:32 PM
  #15  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust finished

The exhaust is installed and this should be the last pictures for this post. The coating is titanium ceramic and the system fits amazingly.





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Old Jun 20, 2019 | 07:28 AM
  #16  
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Re: The beginnings of my 3” dual exhaust

I cant wait to see how loud this thing is.
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Old Oct 23, 2019 | 09:48 PM
  #17  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust


Finally got it running, sounds great. This concludes the exhaust portion of the project.

Last edited by soloc4; Oct 23, 2019 at 10:27 PM. Reason: and context
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Old Mar 7, 2024 | 07:55 PM
  #18  
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust



I added a muffler to the system for a total of three. It is noticeably less raspy and a bit quieter, but still has a nice rumble. I haven’t driven it yet, just idling in the garage, so I can’t comment on the drone level at this time. Overall it is an improvement over what it was prior to the new muffler. It fits perfectly in the center bay of the rear diffuser, so it’s barely noticeable visually.
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Old Apr 11, 2024 | 03:53 AM
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Axle/Gears: 3:42 LSD
Re: The beginnings of my 3” dual exhaust

looks like a precise installation. Curious, what's the ground clearance from the lowest point (perhaps as it goes under the rear differential?)
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Old Apr 11, 2024 | 08:19 PM
  #20  
soloc4's Avatar
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

Originally Posted by GTA1990
looks like a precise installation. Curious, what's the ground clearance from the lowest point (perhaps as it goes under the rear differential?)
I crawled under the car to take some measurements for you. The lowest point of the entire system is 5 cm at the forward V-band clamps and 7 cm under the differential and the new muffler body. The V-bands show some signs of slight scraping, nothing major due to the suspension having only 25 mm of compression while driving. So far the muffler shows no signs of damage. The added muffler makes driving the car much more enjoyable. If you are not running 600+ HP I would suggest not using 3” dual exhaust. The Holley 6.5 cm true dual system is far more civil and will support 500 HP.
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Old Apr 12, 2024 | 12:22 AM
  #21  
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Engine: L31, LT4 hot cam
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Re: The beginnings of my 3” dual exhaust

Ty. I can’t see me having more than 400hp in the near term. Curious about the vette rear suspension but here in Greater London anything less than 10cm of ground clearance risks scraping
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Old Apr 12, 2024 | 12:45 PM
  #22  
soloc4's Avatar
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From: Lake Stevens, WA
Car: 84 Z28, 92 C4 suspension F&R, ABS
Engine: 408 LS2, CNC LS3 heads, Comp Cam
Transmission: Magnum F, RTX clutch, Tick shifter
Axle/Gears: DANA 44 IRS, Tru Trac, 3:73 gears
Re: The beginnings of my 3” dual exhaust

Originally Posted by GTA1990
Ty. I can’t see me having more than 400hp in the near term. Curious about the vette rear suspension but here in Greater London anything less than 10cm of ground clearance risks scraping
Installing a C4 IRS in a 3rd gen F-body has been done several times and is not that difficult compared to the SLA front suspension, but it is a bit more of a commitment than a curiousity. As far as ground clearance under the differential, remember that it will remain constant at the point of the wheels traveling over the same object (i.e. a speed hump). For example, I have 76 mm of clearance on level ground and I will still have 76 mm of clearance as the tyres roll over the obstruction. A 63 mm exhaust system and 10 mm of additional ride height would give the 10 cm of ground clearance that you desire. I have a thread on this forum that covers the installation of the "Corvette suspension" in our cars if you are intrested in seeing what is involved (the wheel tubs are optional). You can PM me here anytime if you please.
Cheers
Steven
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Old Apr 18, 2024 | 08:40 AM
  #23  
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Re: The beginnings of my 3” dual exhaust

thanks, appreciate that
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