DPF/CAT delete pipe vs. complete system - Ford Powerstroke Diesel Forum
6.7 Performance Parts Discussion 6.7 Performance Parts Discussion

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post #1 of 7 Old 08-12-2013, 04:58 PM Thread Starter
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DPF/CAT delete pipe vs. complete system

Is there any difference in just doing DPF/Cat delete pipe vs the entire downpipe back system beside the obvious that one is complete downpipe back and one is just the dpf pipe?
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post #2 of 7 Old 08-12-2013, 07:22 PM
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No besides the factory muffler

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post #3 of 7 Old 08-13-2013, 05:30 PM Thread Starter
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Cool

So is there any actual performance advantage to a complete 4-5" system as to just putting in delete pipe or is more just for looks and to say I have bigger exhaust then you? lol
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post #4 of 7 Old 08-13-2013, 05:39 PM
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A clip from the latest Diesel Power magazine

Pipe Dreams

Diesel enthusiasts already know the great power potential and more efficient fuel consumption offered by a diesel truck.All that power and economy doesnt come without picking the right parts though. An after market high flow exhaust system has to do more than simply make your truck sound better. Point in case with a 4" vs. 5 or 6 inch system, how big do you need to go? To answer that first we need to go over a few basics.
On most contemporary turbodiesel engines, the exhaust comes right off the exit of the turbo and after market exhaust manufacturers offer more than one tubing size to vent the exhaust more quickly.
One advantage of moving exhaust gasses quickly and efficiently is to reduce buildup of heat( lower egts ). Turbo diesel engines generate alot of heat, especially when the engine is under a heavy load. A high flow exhaust actually allows your diesel engine to run cooler and adds the potential for more boost when towing.
Large diameter tubing also reduces backpressure, making it easier for the pistons to shove that exhaust out of the cylenders and resulting inmore horsepower. Less backpressure allows the turbin to spin more efficiently, therefore it will build boost quicker and run cooler.
Interestingly enough however there is a point where bigger isnt necessarly better. While engine testing indicates that going from 3-1/2" to 4" can reduce backpressure by as much as 98%, ther can be less than 2% reduction above 4" exhaust. SO while a 5 or 6" exhaust looks cool it wont give you much more than just a coolness factor


That being said the factory muffler last time I checked was a straight through design as well. So will it perform less than a aftermarket of the same diameter, no

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2011 F350 KingRanch 6.7L
AFE stage 2 intake
H&S tuner 4" straight pipe
dual 6" MBRP black stacks. DPF, DEF, EGR Delete
ZEX NOS kit with .088 jet
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post #5 of 7 Old 08-13-2013, 08:29 PM
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The turbo housing is going to be the limiting factor in backpressure drop and etc 90% or more of the time

2010 CC/SB FX4 Lariat.. Tuned By Eric@IDP and Matt@Gearhead

Thinking about getting rid of the stock 6.7 turbo?
Check this out... and research before buying



http://www.powerstroke.org/forum/6-7...ustration.html

http://www.powerstroke.org/forum/6-7...round-2-a.html
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post #6 of 7 Old 08-14-2013, 04:10 AM Thread Starter
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So pretty much unless you have some modded up truck with bigger turbo etc... that huge is exhaust is just so you can say my pipe is bigger then yours? If that's the case I am just going to do delete pipe because I actually don't mind the look of the factory tip. Going to actually black it out.
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post #7 of 7 Old 08-14-2013, 07:50 AM
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No , nobody gets large exhaust just to say it is biggest.they get it for the reasons mentioned earlier. Lower egts, sound, as well as looks. Larger diameter pipes sound better. A deeper throaty sound. Then get the full muffler delete straight pipe and it sounds even better yet. As cheap as exhaust systems are, just get the full kit. Easier to install, sounds better , flows better, looks better. 2011-2012 Ford F250 6.7L Magnaflow Exhaust System - Dual Outlet 17948


And.... It removes about 100 pounds of useless weight

2015 F350 King Ranch
monochrome tuxedo black, every possible option.
Ordered April 30, 2014
Yet to be delivered

2011 F350 KingRanch 6.7L
AFE stage 2 intake
H&S tuner 4" straight pipe
dual 6" MBRP black stacks. DPF, DEF, EGR Delete
ZEX NOS kit with .088 jet
http://www.facebook.com/video/video....91500544216050

08 Harley Davidson F350
6" lift with 36x15.50x20's
spartan tuned and deleted.

Last edited by matty21; 08-14-2013 at 07:26 PM.
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