Exhaust Mods
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New User
Joined: Aug 2007
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Exhaust Mods
I have a 2003 F-250 6.0L with a tuner Mod and I want to free up my exhaust system but I am not sure how far I can/should go. I have two friends who have "straight piped" their diesels with great results, but since their trucks are the other brands, (*shudders* 1 chevy and 1 dodge) I am not sure if I can or should proceed in the same fashion. Both of theses guys cut out their mufflers and converters last year and have not suffered any ill effects, rather, they both seem to have gained both power and mileage.(and their trucks sound GREAT!!) Should I follow suit? Is it safe? Is this even legal? Please help.
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Joined: Feb 2007
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Straighten it out
Hey man, I have an 2005 (made in Jan 06) F250 and she has a straight 5in pipe from the turbo out. I have had no problems and she runs great. Just check your state emission standards first to be sure you can.
Second, check your engine for an "Catalyst Emissions" sticker. If you do not have one, you can remove the cat.
Second, check your engine for an "Catalyst Emissions" sticker. If you do not have one, you can remove the cat.
Laughing Gas
Joined: Jan 2007
Posts: 810
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From: Sarasota, FL
It is safe to run turbo back systems with no cat and no muffler. The legal part you have to check with you local laws for that one. According to federal law it's not legal to remove a cat from any vehicle that requires one but the odds of getting caught are slim. If you still have any warranty left you will not find a dealer to work on one that has had a cat removed. From what i've read the only benefit to removing both are lower egt's and the turbo should spool faster. i have a cat back and system and do not plan on removing the cat until my warranty is gone. just my .02
Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
Originally Posted by BGMSPD
If you still have any warranty left you will not find a dealer to work on one that has had a cat removed. From what i've read the only benefit to removing both are lower egt's and the turbo should spool faster.
Cargo Master
Joined: May 2002
Posts: 3,271
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From: Gulf Coast, FL
Get a new downpipe, take the kitty to the vet and drop the muffler. On that '03 of yours it will sound INSANE with the jet whistle. Your friends will hate you, neighbors will probally move and you will LOVE the sound.
Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
Originally Posted by origcharger
Theres a newer Dodge diesel around here that is obviously running without muffler or cat., I think it sounds like crap.
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Senior User
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From: Woodbine, Maryland
03's will have a cat. 03's also are the loudest out of the bunch when straight piped. If you dont like turbo noise, keep the muffler and cat. If you want to be loud and sound like a 747, straight pipe it and never look back. I would go 4 inch from the turbo back.
if you do straight pipe it, be prepared for alot of questions from other diesel owners.
if you do straight pipe it, be prepared for alot of questions from other diesel owners.
Junior User
Joined: Apr 2007
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comparison between the 2.
my brother has an '03 6.0 with an mbrp 4" turbo back exhaust with a muffler - no cat. i have an '07 6.0 with a magnaflow 4" turbo back exhaust with a muffler. 4" downtube on the magnaflow but similar systems. His truck does have a lot more turbo noise than mine. My recollection was that he didn't have a factory cat, i guess i was wrong.
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New User
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I have acquired all of the necessary pipe....will be getting to cutting probably next weekend (not this coming), right after I get some more gas for the mig welder. Thanks for the input, I will repost when I get it done.
