Cat delete (stock exhaust) - Page 3 - Ford Powerstroke Diesel Forum
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post #21 of 25 Old 05-15-2016, 11:38 PM
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Originally Posted by smokersteve View Post
I have done the cat and muffler delete pipes. Absolutely love it. Very happy with the performance, sound and cost. About 70 bucks. I have had this set up for about 90,000 miles. Very happy.
Also with living in California the cat delete pipe super easy and convenient.

Don't gut you catalytic converter. Just get the delete pipe.
If you have to deal with a smog program then you are going to need to keep the cat in the exhaust. You do not need the muffler since it is not a emissions device. But the down pipe and cat must remain stock, after the cat converter you can do whatever you wish. But no 4" down pipe or any changes from the cat to the engine.
I can assure you though the open can of the cat smoothes out the exhaust note a ton. I ran my truck with straight pipe all the way back and it was raspy as hell. There was a drone in the exhaust, my old truck had a empty cat and sounded much better than my straight pipe system. So I took the cat from this truck and knocked out the honeycomb and welded 4" pipes to it and placed in the stock spot.
As soon as it was installed the exhaust drone was gone. Strange that a open body has that affect on the exhaust sound but I assure you that it does.
If you want a loud growl out of your truck straight pipe it all the way. If you want to keep it a bit smoother and quieter put the cat body back in.
As far as power gains without the cat you won't get any. The one gain you will get from removing the cat is 100* lower EGT. Mileage will also be the same, the cat does not change the power or mileage. But it does change the sound of the exhaust for sure.
I also installed a Corsa muffler on my truck to tone it down a bit more. It's a straight through design and uses new technology on sound waves. Pretty cool muffler really all stainless steel too btw no packing of any sort.

Good Luck on your truck..............

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ARP Studs, O-Ringed Heads
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DC Power 270XP Die Hards
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4” Diamond Eye SS Exh System
W/two 4” SS Diamond Eye mufflers.
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post #22 of 25 Old 05-16-2016, 08:54 AM
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Originally Posted by jdb820 View Post
i also have been thinking about deleting my cat on my 05. i saw on a youtube video that the powerstrokehelp.com guy said that you will loose mpg if you delete the cat with out a programer, due to lose of back pressure. is that true? sounds odd. i want to do something to let it breath better and get lower egts but i dont want to to loud that my little boys cant sleep in thier car seats.
You wont lose MPG's, dont listen to that guy, i got rid of my cat and so no increase or decrease in MPG's. That guy is a fool. I agree with a 4 inch system, worth the money.

Mike

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post #23 of 25 Old 05-16-2016, 09:16 AM
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It will be very loud going with a full straight pipe system.
Thus is my I kept the stock system and did the delete pipes. Not as crazy loud.
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post #24 of 25 Old 05-16-2016, 10:36 AM
Fuel it up again Dummy
 
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Originally Posted by mikeb01453 View Post
You wont lose MPG's, dont listen to that guy, i got rid of my cat and so no increase or decrease in MPG's. That guy is a fool. I agree with a 4 inch system, worth the money.
Mike is correct, that's all rubish. The cat converter is not helping the engine it's only drawback is it does slow down the exhaust so EGT's are a bit higher by around 100*.
That's it no other drawbacks.
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2006 F250 LARIAT CCSB 4X4
6.0 Diesel w/80K 6/19

ARP Studs, O-Ringed Heads
Stage I KC Turbo 10V
DC Power 270XP Die Hards
6.4 Starter, BPD Waterpump
FASS 125 Titanium w/Adj. Press Reg
3” CAC Pipes & CSF 7106 I.C.
4” Diamond Eye SS Exh System
W/two 4” SS Diamond Eye mufflers.
IPR Coolant filter w/ Manifold
CAT EC-1 coolant
SCT X4 ECM Rollback & PHP Tunes
100HP Hercules & 65HP Tow Tune
Icon/Deaver Suspension
Toyo M/T 38/15.50/18
1,000lbs or more other crap too
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post #25 of 25 Old 05-16-2016, 06:55 PM
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Just gone done putting 4in turbo back on my 03. 10x better more responsive. MBRP as well with cat delete. I like the mbrp mufflers.
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