Muff & Cat Delete vs full 4in turbo back - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 01-10-2011, 07:09 AM Thread Starter
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Question Muff & Cat Delete vs full 4in turbo back

I have done some forum searches and can't really find an exact answer to my question. What are some pros and cons of deleting my cat and muffler vs. Putting on 4 in turbo back straight. I don't plan on getting a tuner or chip or anything like that. I can't really afford those types of things. I really just want to change my exhaust note. I deleted my muff on my 03 and it sounded good I am thinking I may just delete the cat and muff and avoid the whole DP installation problems with the 4 in. Thanks for the help in advance.


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post #2 of 15 Old 01-10-2011, 07:30 AM
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It will lower your EGT's a good bit. And the sound will be a tad bit different, and maybe a little more whistle.

But you should have no problem installing the downpipe, as long as you go with a MBRP, or any kit which includes a 3.5" downpipe.

I would get a coolant filter first tough, since your on the stock EGR and head bolts.

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post #3 of 15 Old 01-10-2011, 07:35 AM Thread Starter
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If the MBRP is a 3.5 in downpipe why can't I just get a 4 in cat back and cat delete pipe?


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post #4 of 15 Old 01-10-2011, 07:39 AM
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yes you can. That is what I want to do. Keep the stock dp, cat delete pipe, then a 4" cat back.


The 3 differences between delete pipes and a 3.5" or 4" dp to 4" all the way is more sound, better low end with delete pipes, and very little egt difference.
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post #5 of 15 Old 01-10-2011, 07:42 AM Thread Starter
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I am looking for sound as opposed to performance. I am not a powerhound or anything. I miss the turbo whistle I had on my dually when I deleted the muffler!


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post #6 of 15 Old 01-10-2011, 07:42 AM
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Quote:
Originally Posted by 00Javelin View Post
If the MBRP is a 3.5 in downpipe why can't I just get a 4 in cat back and cat delete pipe?
3.5" is an improvement over stock. The stock downpipe is 3".

You could technically do that, but the bottom part of my MBRP downpipe already starts leading into 4", and then it is 4" all the way back.

If you did it your way it would be a 3" downpipe, and then a 3.5" pipe, and then it would eventually go into a 4" after the cat.

Blake

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4" MBRP Exhaust w/ Muffler (DPF/DOC Delete), Modded Stock Intake, H&S XRT Pro
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post #7 of 15 Old 01-10-2011, 07:44 AM
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post #8 of 15 Old 01-10-2011, 07:45 AM
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Quote:
Originally Posted by 00Javelin View Post
I am looking for sound as opposed to performance. I am not a powerhound or anything. I miss the turbo whistle I had on my dually when I deleted the muffler!
Your '05 will never whistle as loud as that '03. If you delete both the cat and the muffler on your '05, the whistle will probably sound about the same as the '03 with a stock cat and no muffler.

If you would've straight piped that '03, you would have been blown away.

Blake

2013 F-150 CCSB Oxford White FX4 EcoBoost
Loaded with every option...

2008 F-250 CCSB Dark Copper King Ranch 6.4L FX4
4" MBRP Exhaust w/ Muffler (DPF/DOC Delete), Modded Stock Intake, H&S XRT Pro
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post #9 of 15 Old 01-10-2011, 07:53 AM Thread Starter
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I'm thinking I may just delete both in case I don't like it I can put 1 or the other back on. Would be much easier than fooling with the 4 in turbo back install


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post #10 of 15 Old 01-10-2011, 07:53 AM Thread Starter
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A big tip should deepen the resonation a little too, shouldn't it


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