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Old 03-29-2012, 04:19 PM
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Exhaust Question

This is my 2008 F-250 with a dpf delete pipe and a MBRP 5 inch filter back from the delete pipe that I recently bought a couple months ago. All of these parts came on the truck like this. In this picture what is the part that is in front of the dpf delete? Is this the CAT? If so, would the truck run better with or without the CAT? Also in the second picture is the tail pipe. I just recently ordered a MBRP 5 to 6 inch tip because I like the looks of a 6 inch tip. Will the 6 inch tip stick out much? It is 12 inches long and I was wondering if I would have to cut the original 5 inch MBRP pipe back for it to fit with out sticking out a ton. Btw I am a newbie if you can't tell but I am very interested in learning more about the 6.4 Powerstrokes.



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Old 03-30-2012, 05:47 AM
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Originally Posted by Powerstroke6.4 View Post
In this picture what is the part that is in front of the dpf delete? Is this the CAT? If so, would the truck run better with or without the CAT?
Yes, that's the DOC or CAT as it's more commonly referred to. The truck may run just a little better, but you most likely wouldn't notice it. The truck would also be allot noisier and you would have more of the hairdryer/jet/torch/barrel-of-rocks sound with the CAT removed. Do some searches for hairdryer or jet engine sound to see what I'm referring too.

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Originally Posted by Powerstroke6.4 View Post
Btw I am a newbie if you can't tell but I am very interested in learning more about the 6.4 Powerstrokes.
Welcome to the ORG.
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Old 03-30-2012, 08:49 AM
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OK thanks a lot. That helps to know. I will probably be removing it then. What about the tip? Will I have to cut it back so it doesn't stick out much?
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Old 03-30-2012, 12:51 PM
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either cut it back or have it sticking out inside the tip hahaha. but yes, the pic is small but what it looks like is you have a 5" mbrp dpf back exhaust with no tip. what you want to do is get your new tip, slide it on the exhaust an dget it about where ya want it, mark it and cut about 2-3 inches towards the end of the pipe from where you marked it so that when u clamp it down it has pipe to clamp onto unless you bough a weld on tip.

like he said above that is the cat and you have just a dpf delete pipe, best thing to do is just to buy a dpf/doc delete pipe and bolt it up to get rid of the cat. these trucks arent very loud straight pipe. the hair dryer sound is the wooshing of the air from the turbos, it doesnt really have a whistle is just sounds like a bunch of air is coming through the exhaust. But if you dont mind a little turbo sound, then delete the cat. the cat prolly cuts down on the smoke a little and the exhaust wont smell as potent with it on there.

Hope ya like your new truck
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Old 03-30-2012, 04:10 PM
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Thanks so much guys. This helps a lot! When I get my tip I will probably cut some of the 5 inch MBRP so it doesn't stick out much. Could I cut the exhaust back with a regular hack saw? Or would you recommend cutting it with a different tool?
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Old 03-31-2012, 01:47 PM
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use a sawzall or a metal cutoff wheel for a 4 inch grinder, hack saw might take a minute, lol
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Old 03-31-2012, 07:25 PM
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I used sawzall with a fine tooth blade and it slices right through it.
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Old 04-03-2012, 04:25 PM
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I was putting on my 4" downpipe back exhaust and had to make a couple cuts so it would fit my short bed truck. I originally thought I would just hack saw it, got 4 strokes into it and said F that. I pulled out the jig saw and put in a metal blade. It cut through the pipe like a hot knife through butter. Just another option for you....Wish I had a sawzall for stuff like this.
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