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Fuel System, Air, Exhaust, & Emissions Upgrades Discuss upgrades to the Duramax fuel system and air system. Bigger turbochargers, more turbo chargers, air boxes, exhaust systems, emissions systems, and fuel pumps all go here.

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Old 04-25-2011, 06:35 PM   #1 (permalink)
GMCDieselPower
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Stack need back pressure?

Hi
I have a 93 6.5TD. Everything is stock. It looks like it has a 4 inch exhaust and I don't see a muffler or cat, but it is quiet. The pipe exits the right rear. I am going to install a 4 inch flex bend where the bed starts and up through the bed into a single 5 inch stack. If it looks bad with that large of a stack I may change it to a 4 inch stack.

What I am wondering is if I will need some back pressure? If so, will a straight through muffler create enough back pressure to keep things good with the engine and turbo? The air box is stock and everything else is stock.

I would like a little more sound and to reduce egt. I am not interested in smoke or excessive awful noise. Just deeper sound, nice looks of a stack and lower egt's. This truck runs very good and I see no existing muffler or cat. It is quiet and I am surprised.

Any advice will be greatly appreciated.

Thank you. (Ohio does not emission test)

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1993 GMC C2500HD
6.5 Turbo Diesel
250,000 Miles
After market air intake
Open exhaust, stack 4"
Replaced IP DB2-4911 at 240,000 miles
Wellman anti swell 60G glow plugs
New AC Delco injectors
Genuine AC Delco ACD1000, 12 psi, 35 gph lift pump
Clean running
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Old 04-25-2011, 08:53 PM   #2 (permalink)
WHTDMAX06
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The turbo creates more than enough back pressure for the engine by itself. The turbo also muffles the engine so a muffler may not even be necessary depending on how loud or quiet you want your truck.

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Old 04-25-2011, 09:25 PM   #3 (permalink)
GMCDieselPower
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Ok, that sounds great. I appreciate your help with that.
Thank you!
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1993 GMC C2500HD
6.5 Turbo Diesel
250,000 Miles
After market air intake
Open exhaust, stack 4"
Replaced IP DB2-4911 at 240,000 miles
Wellman anti swell 60G glow plugs
New AC Delco injectors
Genuine AC Delco ACD1000, 12 psi, 35 gph lift pump
Clean running
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Old 01-21-2020, 12:14 PM   #4 (permalink)
GMCDieselPower
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I went with the 4" stack. It does not need a muffler as it is not loud. I added an after market cone filter on the intake to the turbo and now I can hear the turbo. I love the chrome stack and pulling out the air box and just going with the cone filter.

256,000 miles and still running great. I did have to replace the DB2-4911 fuel injection pump about 3 years ago. It was getting hard to start and I was experiencing power loss going up mountains.

I look forward to summer. I have some maintenance items I need to take care of.
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1993 GMC C2500HD
6.5 Turbo Diesel
250,000 Miles
After market air intake
Open exhaust, stack 4"
Replaced IP DB2-4911 at 240,000 miles
Wellman anti swell 60G glow plugs
New AC Delco injectors
Genuine AC Delco ACD1000, 12 psi, 35 gph lift pump
Clean running
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Old 01-21-2020, 12:36 PM   #5 (permalink)
OkDually
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Quote:
Originally Posted by GMCDieselPower View Post
I went with the 4" stack. It does not need a muffler as itThanks for is not loud. I added an after market cone filter on the intake to the turbo and now I can hear the turbo. I love the chrome stack and pulling out the air box and just going with the cone filter.

256,000 miles and still running great. I did have to replace the DB2-4911 fuel injection pump about 3 years ago. It was getting hard to start and I was experiencing power loss going up mountains.

I look forward to summer. I have some maintenance items I need to take care of.
Thanks for giving an update on this

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