to remove my cat convertor or not? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 21 Old 05-01-2011, 03:46 AM Thread Starter
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to remove my cat convertor or not?

I have a 2005 ex, with a 6.0, would like to know if there is any advantage to removing the cat convertor, such as proven horsepower and mpg gains, not just B.S. The only mods so for are, afe replacement filter, and hypertech programmer and egr spool. Or would it be better to replace the whole exhaust?
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post #2 of 21 Old 05-01-2011, 04:26 AM
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Honestly if I were you I would leave it alone and get a cat back system. Mine is an 04 and I took it off and the only thing I noticed is the noise and a small decrease in the low rpm range also there was no mpg gained either because of the sweet sound out of the straight pipe, so even if you try to behave you still hit it harder than you normally would=lower mpg.

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studded and deleted, gauges,Zoodad, idp sct, custom 5" exhaust, 295/85-16 bfg mud terrains, galaxy cb. dvd player, diamond plate tool box, train horns, onboard air, front and rear firestone air bags, 9' western pro plow and a bunch of fire strobes and led lights.
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post #3 of 21 Old 05-01-2011, 04:30 AM Thread Starter
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Thought that to be true. Just like with anything, unless you are making big h.p. numbers than stock is hard to beat. That is why ford, chevy, and dodge have the most money for r and d. They know what works and what doesn't. Thanks for the info.
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post #4 of 21 Old 05-01-2011, 04:32 AM
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Looking for performance, step up to a turbo-back 4" exhaust system w/o CAT (if your state inspection allows it, or use a CAT delete pipe). That will show gains and support upto around 500HP. If you're shooting for more than that (which requires quite a bit on the 6.0L), you'll want to find a 5" system.

Removing the CAT alone, won't really show much in the way of gains. However, you will see a minor drop in EGT's 50-100* at WOT, and make the turbo whine much more pronounced.
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post #5 of 21 Old 05-01-2011, 04:43 AM
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I wouldn't go that far because just look at what any of these engines are capable of in there other homes aka medium duty delivery trucks, buses, heavy machinery and boats. Stock is just the safest for the long haul, the more you add power the less the engine will last but these engines were designed for way more power than they are giving us. That is why we can safely add up to 100 hp or so, and don't beat on it, it ill last for years without trouble.

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studded and deleted, gauges,Zoodad, idp sct, custom 5" exhaust, 295/85-16 bfg mud terrains, galaxy cb. dvd player, diamond plate tool box, train horns, onboard air, front and rear firestone air bags, 9' western pro plow and a bunch of fire strobes and led lights.
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post #6 of 21 Old 05-01-2011, 06:25 AM
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wheni got my bigger exhaust with muffler and cat delete i noticed a substantial drop in egts, sorry but stock exhaust on these trucks is not better for the long haul.
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post #7 of 21 Old 05-01-2011, 10:47 AM
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Quote:
Originally Posted by Ray Caraway View Post
That is why ford, chevy, and dodge have the most money for r and d. They know what works and what doesn't.
what works and what doesnt and what works best, are three different things.

a manufacture has to sell a product that works for MANY different buyers, 90 year old women, 50 year old men etc.

yea the truck has a radio, but its so so at best. aftermarket fills the gap.

yea my truck came with a trans temp gauge.... it was engineered with R and D money...... but its a glorified idiot light. aftermarket fills the gap.

ford really R & D'ed the **** out of the 6.0 cooling system didnt they........oh wait.... nevermind
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post #8 of 21 Old 05-01-2011, 01:02 PM
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exactly, take that darn cat off end of story
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post #9 of 21 Old 01-14-2012, 03:10 AM
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so............ what did you end up doing ?

Quote:
Originally Posted by Ray Caraway View Post
I have a 2005 ex, with a 6.0, would like to know if there is any advantage to removing the cat convertor, such as proven horsepower and mpg gains, not just B.S. The only mods so for are, afe replacement filter, and hypertech programmer and egr spool. Or would it be better to replace the whole exhaust?
i took off the cat and the muffler and all i noticed was how ridiculous it sounded and even a little bit of loss of power , what i ended up doing was leaving the cat out and putting the muffler back on , turbo spools up quick from the start and it seems like i got more power with ouit the cat
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post #10 of 21 Old 01-14-2012, 05:59 AM
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i did a full turbo back.. it has a muffler but no cat... muffler is straight through (cherry bomb) type

sounds great, really screams when i romp on it

I noticed no power but i did gain 1 mpg
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