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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 09-06-2018, 11:16 AM   #1 (permalink)
dk2429
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Want to straight pipe my truck

Got a few questions since Im new to all this exhaust stuff..

The exhaust the truck came with is what I was told is a 4" MBRP pass through..

I'm wanting a 5" straight pipe. I got to looking online and saw things like "turbo back" and "cat back" and what not. What do these mean?

Also, how difficult would it be to install a 5" on my truck, and what do y'all recommend i go with?

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2006 Silverado 2500HD short bed crew cab, LBZ Duramax.
Cold air intake, EGR delete, Kory Willis PPEI 100HP, Black Oak LED light bar, turbo resonator delete, 4" MBRP straight pipe turbo back, Edge CTS2 Insight
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Old 09-06-2018, 11:33 AM   #2 (permalink)
steakman
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Have a look for the "SEARCH" Button...?

And fill out your signature file. (Truck/Van.? Engine.? LB7, LLY, LBZ, LML, LMM etc., 2 dr/4dr, 2/4X4 etc, Year, Mods etc.)

for starters...
Theo

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Old 09-06-2018, 11:40 AM   #3 (permalink)
dk2429
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Quote:
Originally Posted by steakman View Post
Have a look for the "SEARCH" Button...?

And fill out your signature file. (Truck/Van.? Engine.? LB7, LLY, LBZ, LML, LMM etc., 2 dr/4dr, 2/4X4 etc, Year, Mods etc.)

for starters...
Theo
Silverado 2500HD short bed crew cab, LBZ Duramax. 4x4

Cold air intake, EGR delete, Kory Willis PPEI 100HP
__________________
2006 Silverado 2500HD short bed crew cab, LBZ Duramax.
Cold air intake, EGR delete, Kory Willis PPEI 100HP, Black Oak LED light bar, turbo resonator delete, 4" MBRP straight pipe turbo back, Edge CTS2 Insight
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Old 09-08-2018, 07:13 PM   #4 (permalink)
oldschoolbowtie
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I would recommend you look at some of the write ups on the 5 inch exhaust and make an informed decision based on your needs...


food for thought: I have 4" exhaust and no regrets

I found this and it has some good points-

Sound difference

The biggest difference between a 4 inch and 5 inch exhaust system is the sound. Each exhaust system will remove the restrictions found in the stock exhaust. Naturally the exhaust is going to be slightly louder. If you travel long distances on the highway, freeway or interstate and want it quiet get a 4in. If you tow a trailer for extended periods of time and want it quiet get a 4in. If you want to have a conversation in person or over the phone get a 4in. In general, if you want an exhaust system that is fairly quiet get a 4". The 4in system will have a higher pitched sound, where as the 5" will have a deeper tone. Either system you should be able to hear an increase in noise from the turbo.

Exhaust Gas Temperatures (EGT’s)

With a larger surface area and better flow; a 5” exhaust system will dissipate heat more efficiently then a 4” exhaust system. Your EGT’s will be slightly lower (50-100 degrees). Whether you install a 4 inch or 5 inch system, the biggest contributing factor in lowering exhaust gas temperatures will be removing the restrictions in the stock exhaust.

Performance Gains

When testing on our dyno we have found very minimal horsepower gains when comparing 4” and 5” systems. On a mostly stock truck with a tuner, intake and exhaust the 4” exhaust generally has more bottom end torque. This is because the turbo needs a certain amount of back pressure to spool up efficiently. The 5” exhaust has slightly higher horsepower at the top of the RPM range (5-10 horsepower). Its not until you get into the higher horsepower applications 500hp+ that there’s a significant difference. So if your truck is making 500 horsepower or less; its best to go with a 4” exhaust. If you truck is making 500 horsepower plus; its best to go with a 5” exhaust.

end quote
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2007.5 3500HD Silverado LTZ
Kennedy Custom Tune Banks Intake and 4 " exhaust, Air Dog 150, Leveled front end, aftermarket upper control arms, tie rod end sleeves, bypass oil filter, Pusher 3" "hot side" charger tube, aFe Turbo inlet pipe, PPE deep Trans Pan with temp gage, 2 low mod for front differential disable, PACBRAKE 5000# Air Bags with remote on board air...otherwise stock


1953 Chevy truck 496 2 NOS kits ...otherwise stock


1927 Roadster 383 2 NOS kits chassis car (street legal)// otherwise stock
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Old 09-10-2018, 08:34 PM   #5 (permalink)
tnDan
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Just going to put this out there:
-I really dislike ALL/ANY straight piped road vehicles.

Nothing like cruising down the road with your windows open and have some d-bag blast your (or kids) ear drums out as they pass you.

Now your 1000hp sled truck at the track, 500hp circle track car, drag piped flat tracking twin etc....cool.
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Old 09-12-2018, 02:09 PM   #6 (permalink)
dk2429
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Quote:
Originally Posted by oldschoolbowtie View Post
I would recommend you look at some of the write ups on the 5 inch exhaust and make an informed decision based on your needs...[IMG class=inlineimg]/forum/images/smilies/thumb.gif[/IMG]


food for thought: I have 4" exhaust and no regrets

I found this and it has some good points-

Sound difference

The biggest difference between a 4 inch and 5 inch exhaust system is the sound. Each exhaust system will remove the restrictions found in the stock exhaust. Naturally the exhaust is going to be slightly louder. If you travel long distances on the highway, freeway or interstate and want it quiet get a 4in. If you tow a trailer for extended periods of time and want it quiet get a 4in. If you want to have a conversation in person or over the phone get a 4in. In general, if you want an exhaust system that is fairly quiet get a 4". The 4in system will have a higher pitched sound, where as the 5" will have a deeper tone. Either system you should be able to hear an increase in noise from the turbo.

Exhaust Gas Temperatures (EGT’s)

With a larger surface area and better flow; a 5” exhaust system will dissipate heat more efficiently then a 4” exhaust system. Your EGT’s will be slightly lower (50-100 degrees). Whether you install a 4 inch or 5 inch system, the biggest contributing factor in lowering exhaust gas temperatures will be removing the restrictions in the stock exhaust.

Performance Gains

When testing on our dyno we have found very minimal horsepower gains when comparing 4” and 5” systems. On a mostly stock truck with a tuner, intake and exhaust the 4” exhaust generally has more bottom end torque. This is because the turbo needs a certain amount of back pressure to spool up efficiently. The 5” exhaust has slightly higher horsepower at the top of the RPM range (5-10 horsepower). Its not until you get into the higher horsepower applications 500hp+ that there’s a significant difference. So if your truck is making 500 horsepower or less; its best to go with a 4” exhaust. If you truck is making 500 horsepower plus; its best to go with a 5” exhaust.

end quote [IMG class=inlineimg]/forum/images/smilies/eek.gif[/IMG][IMG class=inlineimg]https://www.dieselplace.com/forum/images/smilies/facepalm1.gif[/IMG][IMG class=inlineimg]https://www.dieselplace.com/forum/images/smilies/sSig_2cents.gif[/IMG][IMG class=inlineimg]https://www.dieselplace.com/forum/images/smilies/sSig_2cents.gif[/IMG]
Thank you very much for this write up, very informative!!

From what your saying, I SHOULD go with a 4".. Lots of driving, tow often, making under 500hp, etc.. But, after listening to these trucks with a 4" and 5", I prefer the deep throaty sound of the 5". I honestly never cared anything about "being loud." My brother straight piped an LMM at his shop.. I started it up to move it, and fell in love with that sound. It has a 5". Sounds ****ing great.

Ill do some more research as you mentioned.. But when it does come time to my decision, who do you recommend to go with? I was told Diamond Eye.
__________________
2006 Silverado 2500HD short bed crew cab, LBZ Duramax.
Cold air intake, EGR delete, Kory Willis PPEI 100HP, Black Oak LED light bar, turbo resonator delete, 4" MBRP straight pipe turbo back, Edge CTS2 Insight
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Old 09-12-2018, 07:34 PM   #7 (permalink)
tnDan
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Plenty of quality exhaust options out there.
Diamond eye just the current leader in the lower price range, IMO.
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1995 Ram 2500 RCLB, 12V/NV4500 (trail rig)
2014 Chevy Cruze 2.0TD (50+mpg)
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