How much HP does a straight exhaust/aftermarket exhaust gain? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 10-02-2009, 01:13 PM Thread Starter
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How much HP does a straight exhaust/aftermarket exhaust gain?

I saw on MBRP's website they advertise like 25hp and 53lbs of torque from putting their 4" exhaust on. Is that true?

I've heard there is VERY little difference between a factory straight pipe exhaust, and a 4" exhaust or bigger until you hit like 400hp or so, and about 25-50* egt differences
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post #2 of 12 Old 10-02-2009, 01:45 PM
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I don't think you really gain anything until you get a chip. It is pretty much a supporting mod.

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You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #3 of 12 Old 10-02-2009, 01:59 PM Thread Starter
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Thats exactly what I thought. i mean, I can understand factory exhausts hold lots of backpressure etc.. but they are advertising numbers on their site.

What would the HP differences be between a truck w/ a straight exahust or a bigger exhaust and a chip, and a stock exhaust plus a chip?
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post #4 of 12 Old 10-02-2009, 02:00 PM
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Not to much of a gain. Not noticable, besides sound. Definately a necesity with a chip, etc.

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post #5 of 12 Old 10-02-2009, 02:03 PM Thread Starter
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I wonder why MBPR advertises such numbers then
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post #6 of 12 Old 10-02-2009, 02:04 PM
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Don't know... the AFE stage II claims like 50 horsepower...

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Originally Posted by Mannysouza View Post
You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #7 of 12 Old 10-02-2009, 02:06 PM Thread Starter
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what lying bastards. ah well. I didn't believe them, quite the opposite in fact. thanks for clearing that up guys
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post #8 of 12 Old 10-02-2009, 04:33 PM
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I gained 26.3 HP after installing my 5" system and another 16 with the stack
Not really
Come on guys you all know why all these companys are putting #'s on there products...SALES!!!! I would do the same thing if i was them

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post #9 of 12 Old 10-02-2009, 06:23 PM
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I can tell you from personal experiance that once you stright pipe your OEM exhaust you will not see any real gain from an aftermarket exhaust until you are close to 400hp. However if you go from a Factory muffled exhaust to an OEM muffled exhaust I can absolutely see 25hp. The Factory muffler is very restrictive.
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post #10 of 12 Old 10-03-2009, 06:51 PM
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I have a completely stock truck and I just installed a 4" turbo back aluminized exhaust. I felt like I lost a little a low end power. I didn't dyno it and I can't say for sure. I plan on a intake next followed by a chip. I was trying to get my truck breathing good before installing the chip. I also saw the advertised gains for the exhaust and was dissapointed. I am new to diesels and trying to learn myself. Hope my input helps you with your decision.
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