Exhaust system plan

Discussion on fuel delivery & intake/exhaust tech & mods.
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Turbopowered68
Posts: 141
Joined: Wed Nov 04, 2020 7:09 pm

Exhaust system plan

Post by Turbopowered68 »

Has anyone done --
1- Off of the manifolds to a single 3 inch
2- To another Y
3- After the rear Y one side to a good quiet muffler the other side
4- to a straight pipe with a mechanical valve that only opens at a certain throttle percentage?? Also probably saves a good amount of weight????
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Caprice exhaust plan.png
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2014 Caprice V8
Elgin E-1840 P, LS9 Head gasket, LS7 Lifters, PAC-1218 springs, Trunion upgrade, Single roller timing set, Melling oil pump, ZL1 torque converter, Camaro Trans pan and filter.
1986 GN
212/212 Roller cam, 1.65 HR Rockers, 60-1 turbo, XFI 2.05, E85, Ebay Front mount IC, Husek Built TH200-4R trans, 3.42 gears 3800# .
1968 Chevelle
LQ4, 4L80, 12 bolt w/3.42 gears
CapriceX2
Posts: 85
Joined: Sat Jun 22, 2019 10:06 am

Re: Exhaust system plan

Post by CapriceX2 »

A single 3” pipe should be good for about 360 hp without restriction. Though your design looks like an improvement over the factory setup, it doesn’t look like it leaves you much room for growth if that is in your plans.
CapriceX2
2011 Caprice 9C3 - TSP 220R W/ DOD delete, 10.8:1 Compression, Custom Stainless Exhaust
1995 Caprice Classic Wagon
1996 K2500 6.5L diesel
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kevink
Posts: 480
Joined: Sun Aug 09, 2015 12:55 pm

Re: Exhaust system plan

Post by kevink »

What's the point here? How is this any better than true duals in 2.5" or 3" with two mufflers and cutouts before the mufflers?
2011 9C3: 11.48 @118.
Turbopowered68
Posts: 141
Joined: Wed Nov 04, 2020 7:09 pm

Re: Exhaust system plan

Post by Turbopowered68 »

CapriceX2 wrote: Thu Dec 03, 2020 9:24 am A single 3” pipe should be good for about 360 hp without restriction. Though your design looks like an improvement over the factory setup, it doesn’t look like it leaves you much room for growth if that is in your plans.
I have seen LOTS of single 3 inch handle 800 plus hp and go 9.40s
I don't have any plans of going that fast or making that much power.
The goal is turbo and looking to get 600 to the wheels.
2014 Caprice V8
Elgin E-1840 P, LS9 Head gasket, LS7 Lifters, PAC-1218 springs, Trunion upgrade, Single roller timing set, Melling oil pump, ZL1 torque converter, Camaro Trans pan and filter.
1986 GN
212/212 Roller cam, 1.65 HR Rockers, 60-1 turbo, XFI 2.05, E85, Ebay Front mount IC, Husek Built TH200-4R trans, 3.42 gears 3800# .
1968 Chevelle
LQ4, 4L80, 12 bolt w/3.42 gears
Turbopowered68
Posts: 141
Joined: Wed Nov 04, 2020 7:09 pm

Re: Exhaust system plan

Post by Turbopowered68 »

kevink wrote: Thu Dec 03, 2020 12:06 pm What's the point here? How is this any better than true duals in 2.5" or 3" with two mufflers and cutouts before the mufflers?
The single 3 to 2.5 or 2 "quiet time" side will be much quieter than just about any true dual.
plus it will hopefully be lighter than a duel system.
2014 Caprice V8
Elgin E-1840 P, LS9 Head gasket, LS7 Lifters, PAC-1218 springs, Trunion upgrade, Single roller timing set, Melling oil pump, ZL1 torque converter, Camaro Trans pan and filter.
1986 GN
212/212 Roller cam, 1.65 HR Rockers, 60-1 turbo, XFI 2.05, E85, Ebay Front mount IC, Husek Built TH200-4R trans, 3.42 gears 3800# .
1968 Chevelle
LQ4, 4L80, 12 bolt w/3.42 gears
JUNKYARD_JACK
Posts: 134
Joined: Mon May 17, 2021 10:13 am

Re: Exhaust system plan

Post by JUNKYARD_JACK »

I am planning on a similar set up because I cant find an exhaust that seems to tick all the boxes for me. I was planning on some JBA headers although I'm not stuck on a brand, I'm still looking into all the options. I wanted to build dual three inch exhaust out of the header with an H-Pipe then straight back into the factory mufflers. Ideally Id love a pair of electric cutouts eventually but I'm curious how it'd sound with everything except the factory muffler deleted.
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