New exhaust - Ford Powerstroke Diesel Forum
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post #1 of 42 Old 05-17-2017, 06:15 AM Thread Starter
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New exhaust

Im looking into getting a new exhaust for my 06 6.0 and of course going straight pipe an deleting cat n muffler. I was wondering if doing so will put my truck in to limp mode, not having a sct tuner

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post #2 of 42 Old 05-17-2017, 06:44 AM
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No, it won't put your truck into limp mode. Are you going with a Turbo Back or Cat Back exhaust? Some guys have reported a 'drone' with a complete straight pipe exhaust. Depending on the sound you want, and your budget, you could install a Cat Back exhaust with a turbo-style muffler. When installing it, pull the catalyst housing and check to see if the catalyst element has fallen out. Sometimes they just fall out in a thousand pieces and give you a free-flowing exhaust.

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post #3 of 42 Old 05-17-2017, 07:03 AM Thread Starter
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No, it won't put your truck into limp mode. Are you going with a Turbo Back or Cat Back exhaust? Some guys have reported a 'drone' with a complete straight pipe exhaust. Depending on the sound you want, and your budget, you could install a Cat Back exhaust with a turbo-style muffler. When installing it, pull the catalyst housing and check to see if the catalyst element has fallen out. Sometimes they just fall out in a thousand pieces and give you a free-flowing exhaust.
What's drone mean? I was planning on going from turbo back with maybe a 5" Mbrp. I know it's illegal to remove the cat but heard it's better to have it off. Should I keep it on and gut it out? I live in Florida and they dont have inspections

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post #4 of 42 Old 05-17-2017, 07:17 AM
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Drone is a resonating sound that is either constant at a set RPM range, or can change frequency with engine speed. Depending on the severity it can drive you nuts. Most factory built aftermarket systems attempt to design it out. Having an empty cat housing can reduce/eliminate this because the large 'chamber' changes the frequency. I'm no expert, so one of the other guys may come along and correct me.

Keep in mind that a 5" turbo back exhaust with likely do nothing for performance unless you do some serious performance mods, and will most certainly require the removal of your spare tire from under the truck.

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post #5 of 42 Old 05-17-2017, 08:06 AM Thread Starter
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Thanks for the help. What would you recommend doing to get better sound and more power?

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post #6 of 42 Old 05-17-2017, 08:07 AM Thread Starter
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Thanks for the help. What would you recommend doing to get better sound and more power?

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And better mpgs

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post #7 of 42 Old 05-17-2017, 08:13 AM
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5 inch will not require you to remove your spare tire. However, going to 5 inch will not increase your performance unless you're seriously modified.

4 inch TB (biggest downpipe we can install is 4 inch anyways) is more than plenty for 90%of applications.

contact Corey@cncfab (one of our supporting vendors) for options and prices.
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post #8 of 42 Old 05-17-2017, 08:19 AM Thread Starter
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Yea I'm not trying to do anything drastic just want to get some sound and a little more power n mpgs

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post #9 of 42 Old 05-17-2017, 08:24 AM
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I have done this to two trucks now both 2006. So here it goes:

Aluminized pipe will sound better then Stainless Steel. And its because the SS is so thin that you will have sound coming through it.

I had exhaust drone bad when it was 4" turbo back straight piped. I then put on a Donaldson muffler and still had drone in the cab. Then I cut off the pipes to the Cat and welded on 4" pipes to it. Knocked out the honeycomb Cat material and put it back in the stock location and my drone was gone.
So having that open Cat creates a expansion chamber I suppose but it hands down gets rid of any exhaust drone that you would have otherwise.

Trust me I know because it was the same exact result on both of my trucks.

I'm running a Corsa muffler on my current truck but I'm going to replace it with another Donaldson. So the Corsa Muffler will most likely go up for sale. Its a good looking muffler and works off of sound delay technology in one way or another. Its just a little louder then I like at WOT. It has a unique sound at all other speeds I will admit, a bit like a big block gas engine tone.. But at WOT it sounds like a straight piped 6.0 to me. I know lots of guys like that sound I'm just not one of them.

Oh yea go 4" there's NO POINT is anything bigger.
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post #10 of 42 Old 05-17-2017, 08:31 AM
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In my years running my exhaust and brake shops, we found that straight piped exhaust was NOT the way to go. We had a disclaimer for the "drone" with straight piped exhausts. The majority of the time, customers always came back and we installed turbo mufflers.

When I do mine it will be 4 inch AL with a muffler. Nothing else. The kitty will go away.
FYI. Busting up the guts of a Cat converter can be very time consuming. Have a few cold ones handy. And the Kitty on our trucks isn't exactly small.....
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