removing cats vs gutting cats

WhtStang00 · June 20th, 2009, 10:12 PM

I just recently saw a post about removing the cats. Since legally i can't remove mine because of emission checks down here, can i gut all four of the cats?? What will be the effect vs. cutting the cats out?

stephen · June 21st, 2009, 03:33 PM

If you gut out the cats they will no longer work and it's equivalent to replacing them with pipe. It would be obvious to the emission testing equipment since the level of pollutants in the exhaust will be too high.

winnie51189 · June 21st, 2009, 06:14 PM

I don't think he was asking about whether it was legal or not. He sounds like he knows it's illegal to remove or gut them. I think he means sound and/or performance wise, will it have the same results or is one better than the other. I am not positive but I would think cutting them out and replacing with exhaust tubing would be the better of the two options. Although maybe not the cheapest if you are going to gut them yourself.

6ER THEN I 8ER! · June 22nd, 2009, 01:51 AM

in our cars at emissions they dont use the wand tester like an older car...they plug into the comp and test it that way...the nice thing about gutted cats is to keep the appearence of cats during the mirror test...btw, either way and you'll need to purchase some MIL eliminators...

stephen · June 22nd, 2009, 09:26 AM

Originally Posted by 6er_w/a_Vengance

in our cars at emissions they dont use the wand tester like an older car...they plug into the comp and test it that way...the nice thing about gutted cats is to keep the appearence of cats during the mirror test...btw, either way and you'll need to purchase some MIL eliminators...

The type of testing varies from state to state. Evidently in your state they just plug into the OBD II port and check for codes. In Calif. they plug into the OBD II port and also use a probe in the exhaust to measure emissions with the car on a dynamometer. Thus, even if the converters seemed normal from the outside it wouldn't pass here without functioning converters. In states where they only check for the presence of the converters you can probably get away with gutting them out.

If the converters are gutted out or eliminated then you need to eliminate the signal from the rear oxygen sensors since they would recognize that the converters are not working and trigger a code (MIL eliminators).

I would think that either removing the converters or gutting them would get more exhaust flow.

ByPopularDemand · June 22nd, 2009, 11:58 AM

Gutted cats is the option people go with when they want the car to appear as though it has cats.

6ER THEN I 8ER! · June 22nd, 2009, 12:08 PM

also...if your worried about emissions...cut the cats and weld on flanges to the cats...the tubing your putting in place, and the exaust tubing itself...you can pick up flanges from Advance Auto for cheap...something im planning on trying if i ever get a day to go to the exhaust shop...but basically this'll give you the ability to put the cats back in for testing

dschack · June 22nd, 2009, 02:01 PM

Texas doesnt do the mirror test, as long as your not throwing codes youll be ok, id go ahead and go offroad h or x, or keep it legal and cut out the precats and throw in a set of high flows, just my .02

WhtStang00 · June 30th, 2009, 12:29 AM

dschack i will probably do that. i just dont want to get to the inspection place and them tell me i fail lol. but as long as i get MIL eliminators i will be ok about codes right?

winnie51189 · June 30th, 2009, 12:01 PM

Just make your own MIL eliminators, it's much cheaper.
$4.50 DIY O2 Sensor MIL Eliminators

I checked the part numbers at RadioShack today and they are correct, so finding them should be easy. Just an FYI! good luck

June 20th, 2009, 10:12 PM	#1
WhtStang00 Hardcore Enthusiast 2000 Mustang V6 Join Date: Jan 2008 Location: CStat, Texas Posts: 1,006 iTrader: 1 reviews	removing cats vs gutting cats I just recently saw a post about removing the cats. Since legally i can't remove mine because of emission checks down here, can i gut all four of the cats?? What will be the effect vs. cutting the cats out? __________________ White 2000 V6 Mustang\|Black Saleens 18x9\|Flowmaster 40s\|AM CAI\|8000K HIDs\|SCT XCAL III/H&R SS

June 21st, 2009, 06:14 PM	#3
winnie51189 Hardcore Enthusiast 2000 Mustang v6 Join Date: Jul 2008 Location: Evansville, Indiana Posts: 1,294 iTrader: 3 reviews	I don't think he was asking about whether it was legal or not. He sounds like he knows it's illegal to remove or gut them. I think he means sound and/or performance wise, will it have the same results or is one better than the other. I am not positive but I would think cutting them out and replacing with exhaust tubing would be the better of the two options. Although maybe not the cheapest if you are going to gut them yourself. __________________ FOR SALE: v6 cam SPECS: 207/215 110lsa

June 22nd, 2009, 01:51 AM	#4
6ER THEN I 8ER! Premium Member 3.9L V6 Join Date: Apr 2007 Location: Portland, TN Posts: 20,970 iTrader: 1 reviews	in our cars at emissions they dont use the wand tester like an older car...they plug into the comp and test it that way...the nice thing about gutted cats is to keep the appearence of cats during the mirror test...btw, either way and you'll need to purchase some MIL eliminators... __________________ [SIGPIC][/SIGPIC] 6k HIDs - Rear Sway Bar - Mac Prochamber - Goodridge Gstop SS Lines - Lots of Visual Fun - Go Fast Mods (no point in buying...it's a v6) Want to see your car as art...ask me how

June 22nd, 2009, 11:58 AM	#6
ByPopularDemand Hardcore Enthusiast 2000 V6 Join Date: Jan 2007 Location: Albuquerque Posts: 2,670 iTrader: 0 reviews	Gutted cats is the option people go with when they want the car to appear as though it has cats. __________________ 2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears.

June 22nd, 2009, 12:08 PM	#7
6ER THEN I 8ER! Premium Member 3.9L V6 Join Date: Apr 2007 Location: Portland, TN Posts: 20,970 iTrader: 1 reviews	also...if your worried about emissions...cut the cats and weld on flanges to the cats...the tubing your putting in place, and the exaust tubing itself...you can pick up flanges from Advance Auto for cheap...something im planning on trying if i ever get a day to go to the exhaust shop...but basically this'll give you the ability to put the cats back in for testing __________________ [SIGPIC][/SIGPIC] 6k HIDs - Rear Sway Bar - Mac Prochamber - Goodridge Gstop SS Lines - Lots of Visual Fun - Go Fast Mods (no point in buying...it's a v6) Want to see your car as art...ask me how

June 21st, 2009, 03:33 PM	#2
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,182 iTrader: 0 reviews	If you gut out the cats they will no longer work and it's equivalent to replacing them with pipe. It would be obvious to the emission testing equipment since the level of pollutants in the exhaust will be too high.

June 22nd, 2009, 02:01 PM	#8
dschack Regular 2000 Mustang 3.8 Join Date: Mar 2009 Location: San Antonio, Texas Posts: 402 iTrader: 0 reviews	Texas doesnt do the mirror test, as long as your not throwing codes youll be ok, id go ahead and go offroad h or x, or keep it legal and cut out the precats and throw in a set of high flows, just my .02 __________________

June 30th, 2009, 12:29 AM	#9
WhtStang00 Hardcore Enthusiast 2000 Mustang V6 Join Date: Jan 2008 Location: CStat, Texas Posts: 1,006 iTrader: 1 reviews	dschack i will probably do that. i just dont want to get to the inspection place and them tell me i fail lol. but as long as i get MIL eliminators i will be ok about codes right? __________________ White 2000 V6 Mustang\|Black Saleens 18x9\|Flowmaster 40s\|AM CAI\|8000K HIDs\|SCT XCAL III/H&R SS

June 30th, 2009, 12:01 PM	#10
winnie51189 Hardcore Enthusiast 2000 Mustang v6 Join Date: Jul 2008 Location: Evansville, Indiana Posts: 1,294 iTrader: 3 reviews	Just make your own MIL eliminators, it's much cheaper. $4.50 DIY O2 Sensor MIL Eliminators I checked the part numbers at RadioShack today and they are correct, so finding them should be easy. Just an FYI! good luck __________________ FOR SALE: v6 cam SPECS: 207/215 110lsa Last edited by winnie51189; June 30th, 2009 at 12:07 PM.

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