Empty cat? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 07-13-2012, 11:10 AM Thread Starter
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Empty cat?

Searched around and only found some really old posts on this...Can I just empty out my cat and put it back in? Any issues with this? Sound change or anything else I'm not thinking of?

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post #2 of 11 Old 07-13-2012, 11:14 AM
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they may tap on it to test in the future ? it definitely sounds tin like empty ,, it didn't change anything on mine not even a drop in EGT

ohh and the stuff is hard honeycomb like it will take about 30 minutes to beat that out ,, put wood under the flanges when and if u do it so you don't trash em

run a hose and wear a dust mask ,, dispose of junk properly

ps it's called punching your cat or kitty

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Last edited by ZMANN; 07-13-2012 at 11:20 AM.
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post #3 of 11 Old 07-13-2012, 11:22 AM
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Do you still have a muffler? If both muffler and cat are removed you will notice a change in sound. Not annoyingly loud though. Also do run the risk of having them catch it on inspection depending on state.... One thing I've seen done is remove cat/muffler and put in straight sections of pipe with clamps then every year at inspection just release clamps and put back in your cat/muffler for the day

2000 ford f-250 leveled off, crew cab, headlight upgrade, gauges; pyro, boost, tranny. 6637 intake. 06 lariat dash/seats/interior. DP tuned. A dash of this, a dash of that


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post #4 of 11 Old 07-13-2012, 11:24 AM
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they have started roadside inspections so the delete pipe can be an issue

I run the stock muffler just to keep all my motor exhaust components out of scrutiny

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post #5 of 11 Old 07-13-2012, 12:04 PM Thread Starter
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Quote:
Originally Posted by ZMANN View Post

ps it's called punching your cat or kitty

Copy that...from now on I will refer to it as "Punching the Kitty"

06 F350 Lariat
Edge Insight CS
Blue Spring Update, EGR Delete, STC update, Stand Pipes and Dummy Plugs, Turbo feed and drain tube update, Sinister coolant filter, New stock oil cooler, Zerex ELC, RiffRaff Boots, Isspro Fuel PSI, DC Alternator, ARP Studs, Heads from Jared, OEM Head Gaskets, Yukon Dura-Grip Posi
Warren 155cc/stock injectors
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post #6 of 11 Old 07-13-2012, 12:06 PM
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might make searches easier?? that's why I brought it up LOL

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post #7 of 11 Old 07-13-2012, 12:28 PM
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The best thing to do if your going to gut a cat is to run a straight piece of pipe through it. It sounds less tinny, and when the exhaust expands in the empty chamber then tries to constrict back to the smaller pipe it can cause a little backpressure. Probably not enough to notice, though. The only way I know of that they could tell is if it was taken off.


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wade
97 F350 CCLB srw 4x4
3" downpipe , gutted EBPV,5" stack
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post #8 of 11 Old 07-13-2012, 12:59 PM
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exactly and you can leave some cat material doing this .. I think it would even pass an xray ..

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post #9 of 11 Old 07-13-2012, 01:34 PM
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If anyone is curious on the whole reversion theory, look up how 2 stroke expansion chambers work, whole different animal, but same principle as far as the chamber goes....interesting regardless.


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wade
97 F350 CCLB srw 4x4
3" downpipe , gutted EBPV,5" stack
6637
autometer sport-comp trans, pyro, boost, oil psi, volts
billet TC, aux trans filter, transgo tugger
pro-comp 16x10 series 98's,Hankook 285 AT's
Rosewood premium 1.5's
E-fuel
SD intercooler
Tony Wildmans tunes

When I find the time: home built front bumper, 7" CAT stack
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post #10 of 11 Old 07-13-2012, 02:10 PM
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Ya I don't mess with the expansion chamber on My PWC's because they need them

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