removing cat/muffler and performance - Ford Powerstroke Diesel Forum
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Old 12-23-2009, 09:03 AM

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removing cat/muffler and performance

hello there, quick question i want to make my 07 f350 standard breath a little better and am thinking exaust is the way to do that. i find that the truck is loud enough stock, roars pretty good around 2400rpm so i am not sure i want to remove the muffler?

i am thinking of knocking the guts out of the cat and replacing it. stupid question but is it a lot louder on the powerstroke to straight pipe it with 4"? what performance change can i expect on a stock motor, no tuner with changing the exaust system? any?

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Old 12-23-2009, 09:11 AM
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The cat is more restrictive over the muffler if you want to decide over the 2. Plus to remove the muffler you have to cut it off from the tale pipe.

I have the delete pipes and it is very loud. increasing to 4" will be louder. I like it loud but some times it fells like too much. But I prefer it the way it is now. my egt's drooped a bunch too.

Just deleting the cat or gutting it will be a good improvement.

tunning will bring out the improvements to our trucks. So tunning the truck will give the most out of the exhaust upgrades because of the VGT operation of exhaust flow.

Last edited by smokersteve; 12-23-2009 at 09:16 AM.
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Old 12-23-2009, 10:47 AM
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Of course it will be louder...but usually only under load...also your turbo...yeah, you will finally hear it for the first time...I love it. Don't neuter the kitty, just put her in the pound....just in case big bro wants you you take it off for inspection...replace with straight pipe, flex pipe (all can be obtained from any big truck shop)...or buy a cat delete pipe (most expensive)...I say don't destroy what you may be able to or have to use later. Enjoy lower EGTs.
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