Why cant i just cut muffler and cats out on exhaust? - Ford Powerstroke Diesel Forum
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Old 12-28-2010, 05:53 PM
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Why cant i just cut muffler and cats out on exhaust?

Hey guys i'm new to diesels so this might be a dumb question. I bought a custom sct tune and now looking to upgrading exhaust.

Instead of spending money on straight pipe 4"exhaust why can't I just cut off the cats and muffler off my stock exhaust??? I know its only 3.5" but only having a tune I dont see it making a huge difference besides on my wallet as I only pull a 8000lb boat every now and then during the summer???

Will it sound different?

or should i just cut cats off or muffler or both??

Thanks
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Old 12-28-2010, 05:58 PM
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need input? what year what state ? the basics
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Old 12-28-2010, 06:07 PM
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2006 f250fx4 crew cab...Indiana (no emission testing). o ya w/k&n filter
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Old 12-28-2010, 06:10 PM
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You'll hear the turbo spool a lot better. Try it, and if you don't like it, buy a 4" Straight Pipe System.
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Old 12-28-2010, 06:11 PM
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that's how much truck is done. sounds good.

i didn't see a reason to upgrade to 4" for a few hundred, and 5" is worthless unless you have enough HP
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Old 12-28-2010, 06:11 PM
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Quote:
Originally Posted by mah77 View Post
You'll hear the turbo spool a lot better. Try it, and if you don't like it, buy a 4" Straight Pipe System.
would you keep the muffler?
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Old 12-28-2010, 06:13 PM
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thats what we did to our f450 dump truck. the cab and chassis exhaust is alot more expensive than exhaust for a non-cab and chassis so i bought the cat delete pipe which was about 60 something then we cut the muffer out. sounds just like my truck yet i spent a couple hundred vs 60 something for the cat delete and whatever you use to replace muffler. i just put a 90 on it and dumped it in front of the back tire
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Old 12-28-2010, 06:15 PM
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It's not that much louder without it.
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Old 12-28-2010, 06:19 PM
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not to piss in your cereal but no emission testing dont mean you can just cut crap off
do you (know) someone that can inspect it. technicly to pass you must have a cat and muffler on . if you know someone then by all means cut away
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Old 12-28-2010, 06:24 PM
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Welcome to the .org

Heck yea she'll sound different. Crash course real quick about what to expect. One is your EGTs will benefit from less restriction especially since you're towing. There are also three different turbo designs in regards to the exhaust turbine. '03 10 blades which whistle like a turbine jet engine and well since right off the top of my head I can't remember the next count for the specific years they maxed out in '07 with 17 if I remember right which in short the more exhaust blades the quieter the whistle and more "hair drier" sound you'll get but they still sound awesome irregardless Yes you can s***can the muffler no questions asked. It's the first thing you should do. As far as the cat, check your local laws or use yourbest judgement but none the less there are absolutely no ill side effects for your truck or the engine and yes you'll be fine splicing 3.5" piping in place of them items.

Look around on the site some and you'll find this place to be a very helpful encyclopedia for the PSD.
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