catalytic converters...help lol

deedub97GT · July 17th, 2011, 07:50 PM

so my car runs a 4" turbo back pipe into a 2.5" y to my catback. i have one stretch of pipe thats 13" long and would be perfect for a cat....but it has a 4" diamiter. the only 4" cats i can find is for deisels...i dont have to pass emissions though i just need the look of the cat. what im wondering is if i can get a diesel cat and run it as is on my engine or if i should buy it gut it and then weld it in?

97S281 · July 18th, 2011, 01:21 PM

I would just gut it.

deedub97GT · July 18th, 2011, 09:51 PM

as of right now thats the plan. i just want to know if it will work lol. and nobody has any clues.

p4ndiamond · July 19th, 2011, 12:19 AM

running it would do it no harm...but you can go to a junk yard or something and gut one...as long as you have it is what ever.

WickedSnake00 · July 19th, 2011, 10:40 AM

Originally Posted by deedub97GT

so my car runs a 4" turbo back pipe into a 2.5" y to my catback. i have one stretch of pipe thats 13" long and would be perfect for a cat....but it has a 4" diamiter. the only 4" cats i can find is for deisels...i dont have to pass emissions though i just need the look of the cat. what im wondering is if i can get a diesel cat and run it as is on my engine or if i should buy it gut it and then weld it in?

Diesel cat is not remotely close to a gasoline cat. Not sure what would happen if you ran it. I'd be concerned about things like temps and build up. Best bet is gutting some junkyard cats.

ReverendDexter · July 19th, 2011, 11:11 AM

You guys can buy cats in a junkyard? That's illegal out here.

WickedSnake00 · July 19th, 2011, 11:50 AM

Originally Posted by ReverendDexter

You guys can buy cats in a junkyard? That's illegal out here.

Local regulation I suppose. I was shocked to find a yard out here with the cars intact. Basically took it from a wreck and dumped it in the yard. You are in environazi California after all.

But for appearance he doesn't even need actual cats. Cut some mufflers or resonators out and weld them in. No one will know the difference.

OptionalStang · July 19th, 2011, 12:11 PM

good luck finding them in our junkyards also..as soon as cars come in they get cut off for scrap..lol,i just sold my old 2 cats for 75 bucks, they guy offered me it and came and picked them up...he had an entire pickup bed full of cat converters..he had a hussle..but why do you need the look of a cat? emissions inspections? if so just buy what are called test pipes or ya, gut a cat...what ever is cheaper and faster id do..

03_StangGuy · July 19th, 2011, 12:16 PM

Are you sure you even need the CAT? I just had my inspection done and I was told as long as your check engine light is on your good to go.

03_StangGuy · July 19th, 2011, 12:24 PM

Are you sure you even need the CAT? I just had my inspection done and I was told as long as your check engine light is on your good to go.

WickedSnake00 · July 19th, 2011, 12:29 PM

Originally Posted by 03_StangGuy

Are you sure you even need the CAT? I just had my inspection done and I was told as long as your check engine light is on your good to go.

Really? In NY I was told they were supposed to visually inspect for them. Of course the shop I went to didn't have a lift low enough for my car, so they just passed it through, not noticing the O/R X pipe.

03_StangGuy · July 19th, 2011, 01:51 PM

I was told by a few people its just the computer check. My rear O2s are off and were allowed 1 incomplete circuit. So it was all good.

WickedSnake00 · July 19th, 2011, 02:07 PM

I found you some cats.

deedub97GT · July 20th, 2011, 05:45 PM

yeah i need the cats for as visual. ide love to rip one out of a junkyard...but i need a 4" inlet and outlet....im going to go ahead and order a car for the deisel and gut it. they are only about 45 bucks.

July 17th, 2011, 07:50 PM	#1
deedub97GT MM's DRUNKEN SAILOR single turbo in the works as fast as i can push it! Join Date: Feb 2008 Location: Great lakes IL Posts: 2,210 iTrader: 0 reviews	catalytic converters...help lol so my car runs a 4" turbo back pipe into a 2.5" y to my catback. i have one stretch of pipe thats 13" long and would be perfect for a cat....but it has a 4" diamiter. the only 4" cats i can find is for deisels...i dont have to pass emissions though i just need the look of the cat. what im wondering is if i can get a diesel cat and run it as is on my engine or if i should buy it gut it and then weld it in? __________________ MILITARY CREW GSM3 i love throbbing meat

July 18th, 2011, 01:21 PM	#2
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	I would just gut it. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

July 18th, 2011, 09:51 PM	#3
deedub97GT MM's DRUNKEN SAILOR single turbo in the works as fast as i can push it! Join Date: Feb 2008 Location: Great lakes IL Posts: 2,210 iTrader: 0 reviews	as of right now thats the plan. i just want to know if it will work lol. and nobody has any clues. __________________ MILITARY CREW GSM3 i love throbbing meat

July 19th, 2011, 12:19 AM	#4
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 14.80 No traction Join Date: May 2010 Location: New Orleans Posts: 1,216 iTrader: 0 reviews	running it would do it no harm...but you can go to a junk yard or something and gut one...as long as you have it is what ever. __________________ GT ENGINE (temporary) 4.30 Gears , 31 spline Moser axles , Detroit tru Trac diff, Jmod 4r70w , Pi intake Hitech stage 2 cam, Vortech V2 3.33 pulley. Alum drive shaft. Lowering kit x2 ball joints ,screamin demon coils, LCA "

July 19th, 2011, 11:11 AM	#6
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,808 iTrader: 0 reviews	You guys can buy cats in a junkyard? That's illegal out here. __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\

July 19th, 2011, 12:11 PM	#8
OptionalStang Banned 1997 cougar 4.6 1/2PI TooFast4theFUZZ Join Date: May 2011 Location: se wi Posts: 991 iTrader: 1 reviews	good luck finding them in our junkyards also..as soon as cars come in they get cut off for scrap..lol,i just sold my old 2 cats for 75 bucks, they guy offered me it and came and picked them up...he had an entire pickup bed full of cat converters..he had a hussle..but why do you need the look of a cat? emissions inspections? if so just buy what are called test pipes or ya, gut a cat...what ever is cheaper and faster id do..

July 19th, 2011, 12:16 PM	#9
03_StangGuy I Poop Entirely Way Too Much Blown 03 GT Join Date: Jun 2007 Location: Long Island NY Posts: 6,917 iTrader: 0 reviews	Are you sure you even need the CAT? I just had my inspection done and I was told as long as your check engine light is on your good to go. __________________

July 19th, 2011, 12:24 PM	#10
03_StangGuy I Poop Entirely Way Too Much Blown 03 GT Join Date: Jun 2007 Location: Long Island NY Posts: 6,917 iTrader: 0 reviews	Are you sure you even need the CAT? I just had my inspection done and I was told as long as your check engine light is on your good to go. __________________

July 19th, 2011, 01:51 PM	#12
03_StangGuy I Poop Entirely Way Too Much Blown 03 GT Join Date: Jun 2007 Location: Long Island NY Posts: 6,917 iTrader: 0 reviews	I was told by a few people its just the computer check. My rear O2s are off and were allowed 1 incomplete circuit. So it was all good. __________________

July 19th, 2011, 02:07 PM	#13
WickedSnake00 MM's king of Neon's 404 - car not found 17.81@87 Join Date: Aug 2010 Location: Diesel Engine Capital of the World, Columbus, IN Posts: 7,373 iTrader: 0 reviews	I found you some cats. __________________ Official Secondhand Snake Build Thread Here Looks Like a Cobra, Sounds Like a Cobra, Tastes Like a Cobra, Not a Cobra. For Sale: P71 Interceptor motor

July 20th, 2011, 05:45 PM	#14
deedub97GT MM's DRUNKEN SAILOR single turbo in the works as fast as i can push it! Join Date: Feb 2008 Location: Great lakes IL Posts: 2,210 iTrader: 0 reviews	yeah i need the cats for as visual. ide love to rip one out of a junkyard...but i need a 4" inlet and outlet....im going to go ahead and order a car for the deisel and gut it. they are only about 45 bucks. __________________ MILITARY CREW GSM3 i love throbbing meat

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