MBRP Turbo Back Kit "Down Pipe" Size
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Senior User
Joined: Aug 2004
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From: Yacolt, Washington
MBRP Turbo Back Kit "Down Pipe" Size
Hi Guys,
I'm getting ready to go 4" straight piped with the MBRP 409SS kit.
It seems this kit comes with a 4" Down Pipe and I've read that a stock 7.3 non-chipped engine should stay below 4 inches on the DP.
Any knowledge on this subject would be appreciated, maybe the design of this system requires it?
Thanks in advance, Walt
I'm getting ready to go 4" straight piped with the MBRP 409SS kit.
It seems this kit comes with a 4" Down Pipe and I've read that a stock 7.3 non-chipped engine should stay below 4 inches on the DP.
Any knowledge on this subject would be appreciated, maybe the design of this system requires it?
Thanks in advance, Walt
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Joined: Jun 2006
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From: Kodiak AK
I have never seen anyone use anything larger than a 4 inch down pipe. After that the rest of the exhaust system can go up. After installing my 4inch down pipe last night I wouldnt imagine any thing larger would fit. I know some people are installing a 3.5 inch but I figure if you are replacing stock you might as well go for the 4.
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Joined: Dec 2006
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From: Cheyenne, WY
The downpipe that most closely matches the outlet of the exhaust housing is best. On a stock turbo, that would 3.5".
If you can get the kit with a 3.5" DP, go for it. Otherwise don't worry about it. It's NOT that big of a difference.
An aftermarket DP will flow much better than the disfigured stocker regardless of size.
If you plan on mods that will increase egt's, at least go with a 3.5" aftermarket DP.
If you can get the kit with a 3.5" DP, go for it. Otherwise don't worry about it. It's NOT that big of a difference.
An aftermarket DP will flow much better than the disfigured stocker regardless of size.
If you plan on mods that will increase egt's, at least go with a 3.5" aftermarket DP.
Laughing Gas
Joined: Feb 2006
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I have read that the 4" doesn't have the back pressure needed without all the mods and it is to free flowing on a stock truck. I believe it created a little turbo lag on the low end if i remember reading correctly. I have the mbrp turbo back with 4" dp and 5" exhaust and i didn't notice any negative effects.
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Joined: Dec 2006
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From: Cheyenne, WY
Backpressure = bad. Your truck does NOT need back pressure.
What the 4" dp does do is move the powerband up a little more.
The reduced back pressure from a free-flowing exhaust will help the turbo spool up better.
What the 4" dp does do is move the powerband up a little more.
The reduced back pressure from a free-flowing exhaust will help the turbo spool up better.
Posting Guru
Joined: Jan 2006
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From: Elkhorn, WI
i would go with a 4 inch down pipe. if you do any mods or tow you will have reduced egts with a 4 inch over a 3.5 also i recommend getting the muffler delete pipe with your kit. it sounds awesome
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Post Fiend
Joined: Jun 2006
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From: Central, Al
What's this muffler thing people keep talking about?
4" = Good and it will support anything you may want to do in the future
4" = Good and it will support anything you may want to do in the future
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From: Cheyenne, WY
Originally Posted by amiller93
What's this muffler thing people keep talking about?
I heard of one once, apparently some sort of device that restricts the exhaust and makes it quiter.
Why would you want do that?
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From: Yacolt, Washington
Hey Thanks Guys,
I know a little bit more now, I tow a 30ft goose about 6k dry wt. I haven't had problem one pulling hills up to the mountains, I've just been trying to improve any design flaws like air intake and exhaust.
Thanks to FTE, I do all my own maintenance and have fixed a lot of stuff, VSS sensor, over head computer, door ajar light, etc.
Only problem is time sharing on the computer with the little women, she only works 3 days a week
Walt
I know a little bit more now, I tow a 30ft goose about 6k dry wt. I haven't had problem one pulling hills up to the mountains, I've just been trying to improve any design flaws like air intake and exhaust.
Thanks to FTE, I do all my own maintenance and have fixed a lot of stuff, VSS sensor, over head computer, door ajar light, etc.
Only problem is time sharing on the computer with the little women, she only works 3 days a week
Walt
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