removing the catalytic converters is bad?

Codeman · June 19th, 2009, 12:26 PM

just go for it and take them off and c if u like the sound it will definately be louder. and perrsonally i like the sound of the v6 and i am sure that if u want it louder removing them will make it definately louder. and on the check engine light someone can prob put a link to the mil eliminators that trick the computer into thinkin it has cats.

orson250 · June 19th, 2009, 01:33 PM

just for reference, when i first bought my car, it had flow 40's on it, but it also had two of the stock cats. i could not hear it at all, it was almost like stock (almost). i took them off and there was a load of difference.

stephen · June 19th, 2009, 02:21 PM

One difference between v6 and v8 is that the v6 fires alternately on the left and right side, but v8 engines fire unevenly between the two sides. Not sure about the precise firing order on a v8 but one could look it up.

stephen · June 19th, 2009, 02:29 PM

Just a bit of trivia. A typical V8 firing order is

1-5-4-3-6-2-7-8

If you draw it it's firing alternately from left to right and down one side. Thus,
you don't get alternate right left exhaust pulses, which causes a different sound and is one reason why v8 exhausts typically have an H pipe with the two sides connected by a pipe.

03SonicBoom · June 19th, 2009, 02:39 PM

When you get them removed tell the mechanic you want the cats back or he can keep them but you want free labor. If you get the cats back you can sell them as they have precious metal in them. I would never pay a mechanic to cut the cats out and let him keep them.

bloodusmc · June 19th, 2009, 03:07 PM

ok my mechanic is telling me their is 4 cats 2 small and 2 big. he is asking me do I remove them all. I told him yes. What you guys think? whats the small ones for?
He also removed the O2 sensors. Will this be bad on gas? I am buying the tuner to shut the CE LIGHT.

Dansby · June 19th, 2009, 03:58 PM

Remove all 4, but DO NOT let him keep the cats.

bloodusmc · June 19th, 2009, 04:03 PM

Will removing the O2 sensors all of them hurt MPG?

ESG-642T · June 19th, 2009, 05:04 PM

Originally Posted by bloodusmc

Will removing the O2 sensors all of them hurt MPG?

You can only remove the rear 02 sensors, car needs the front.

2002 BLK GT · June 19th, 2009, 05:07 PM

No, just remove the last 2 you will loose backpressure, do you have an h or x midpipe? dunno about mpg, plus if a cop stops you they wont know that you suppost to have 4 cats. (Prolly)

Just with 2 removed it will sound loud, I dont remember what you have so please tell me again, Brand exhaust? just mufflers? depending on the charge price, get hi flow cats....

bloodusmc · June 19th, 2009, 06:03 PM

I have a V6 03 mustang Straight Pipes with Flowmasters 44. I am at the shop now he removed the 4 cats and kept the front sensors.

BTW. Do cops check under the car lol. Never heard of that before.

2002 BLK GT · June 19th, 2009, 06:05 PM

They have something with mirrors so they don't have to get under it... How much is he gonna charge you?

bloodusmc · June 19th, 2009, 06:47 PM

I never seen cops in my city do that.
I hope they dont get me. How much is the summon for it? any points or court?

he is charging me $80 with the pipes

bloodusmc · June 19th, 2009, 06:52 PM

wow he just finished changing one and it sounds like a monster. Still second exhaust left.

chromestang01 · June 19th, 2009, 08:19 PM

Originally Posted by bloodusmc

wow he just finished changing one and it sounds like a monster. Still second exhaust left.

didnt i tell you??thanks me!!oh yea,i highly highly doubt your car is gonna be soo loud to where the cops wants to go the extra mile to pull out a mirror and look under your car,it would have to be like nascar loud before they would do that,oh man i would love to see a cop try to even fit a mirror under my stang,its soo low you cant even fit a soda can under it!

stephen · June 19th, 2009, 08:38 PM

Originally Posted by ESG-642T

You can only remove the rear 02 sensors, car needs the front.

+1 otherwise it doesn't have the inputs to adjust the fuel air ratio.

stephen · June 19th, 2009, 08:42 PM

Originally Posted by bloodusmc

I never seen cops in my city do that.
I hope they dont get me. How much is the summon for it? any points or court?

he is charging me $80 with the pipes

You won't be able to pass an emission test if your state requires one.

It's a violation of federal law for a mechanic to remove the converters.

This all varies from state to state. In Calif. you need OBD II compliant converters and the exhaust has to be completely OEM.

ESG-642T · June 19th, 2009, 10:40 PM

Originally Posted by chromestang01

didnt i tell you??thanks me!!oh yea,i highly highly doubt your car is gonna be soo loud to where the cops wants to go the extra mile to pull out a mirror and look under your car,it would have to be like nascar loud before they would do that,oh man i would love to see a cop try to even fit a mirror under my stang,its soo low you cant even fit a soda can under it!

Cutouts and a camshaft can do that!

orson250 · June 19th, 2009, 11:41 PM

Originally Posted by chromestang01

didnt i tell you??thanks me!!oh yea,i highly highly doubt your car is gonna be soo loud to where the cops wants to go the extra mile to pull out a mirror and look under your car,it would have to be like nascar loud before they would do that,oh man i would love to see a cop try to even fit a mirror under my stang,its soo low you cant even fit a soda can under it!

i am about to lower my car and i think yours looks pretty good, what springs did you get?

June 19th, 2009, 12:26 PM	#21
Codeman Hardcore Enthusiast Join Date: Nov 2007 Location: North Dakota Posts: 2,933 iTrader: 1 reviews	just go for it and take them off and c if u like the sound it will definately be louder. and perrsonally i like the sound of the v6 and i am sure that if u want it louder removing them will make it definately louder. and on the check engine light someone can prob put a link to the mil eliminators that trick the computer into thinkin it has cats. __________________ UDP, CAI, True Duals, LTs, 91 Tune from TT, 3.73 gears, Tlok,Windstar upper, GT TB, Ported lower, Comp 218/226 cam, FRPP C Springs, J&M LCA, Tokico Blue shocks and struts, and J&M Full Length Subframe Connectors

June 19th, 2009, 01:33 PM	#22
orson250 Regular 2003 mustang v6 232rwhp@7psi Join Date: Jul 2007 Location: jackson, MS Posts: 244 iTrader: 0 reviews	just for reference, when i first bought my car, it had flow 40's on it, but it also had two of the stock cats. i could not hear it at all, it was almost like stock (almost). i took them off and there was a load of difference. __________________ V0rTech'D

June 19th, 2009, 02:39 PM	#25
03SonicBoom Moderator 2003 Grand Cherokee Join Date: Jul 2008 Location: Indiana Posts: 6,625 iTrader: 0 reviews	When you get them removed tell the mechanic you want the cats back or he can keep them but you want free labor. If you get the cats back you can sell them as they have precious metal in them. I would never pay a mechanic to cut the cats out and let him keep them. __________________

June 19th, 2009, 03:07 PM	#26
bloodusmc Regular 03 Mustang V6 Join Date: May 2009 Location: NJ Posts: 142 iTrader: 0 reviews	ok my mechanic is telling me their is 4 cats 2 small and 2 big. he is asking me do I remove them all. I told him yes. What you guys think? whats the small ones for? He also removed the O2 sensors. Will this be bad on gas? I am buying the tuner to shut the CE LIGHT. __________________ Semper Fi!

June 19th, 2009, 04:03 PM	#28
bloodusmc Regular 03 Mustang V6 Join Date: May 2009 Location: NJ Posts: 142 iTrader: 0 reviews	Will removing the O2 sensors all of them hurt MPG? __________________ Semper Fi! Last edited by bloodusmc; June 19th, 2009 at 04:12 PM.

June 19th, 2009, 02:21 PM	#23
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,262 iTrader: 0 reviews	One difference between v6 and v8 is that the v6 fires alternately on the left and right side, but v8 engines fire unevenly between the two sides. Not sure about the precise firing order on a v8 but one could look it up.

June 19th, 2009, 02:29 PM	#24
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,262 iTrader: 0 reviews	Just a bit of trivia. A typical V8 firing order is 1-5-4-3-6-2-7-8 If you draw it it's firing alternately from left to right and down one side. Thus, you don't get alternate right left exhaust pulses, which causes a different sound and is one reason why v8 exhausts typically have an H pipe with the two sides connected by a pipe.

June 19th, 2009, 03:58 PM	#27
Dansby Hardcore Enthusiast Join Date: Mar 2007 Location: Orange, Texas Posts: 2,285 iTrader: 1 reviews	Remove all 4, but DO NOT let him keep the cats.

June 19th, 2009, 05:07 PM	#30
2002 BLK GT Hardcore Enthusiast 03 Mach 1 & 02 GT *************** Join Date: Apr 2009 Location: S. California Posts: 2,178 iTrader: 0 reviews	No, just remove the last 2 you will loose backpressure, do you have an h or x midpipe? dunno about mpg, plus if a cop stops you they wont know that you suppost to have 4 cats. (Prolly) Just with 2 removed it will sound loud, I dont remember what you have so please tell me again, Brand exhaust? just mufflers? depending on the charge price, get hi flow cats.... __________________ 2003 Mach 1 Procharged 500rwhp club Last edited by 2002 BLK GT; June 19th, 2009 at 05:09 PM.

June 19th, 2009, 06:03 PM	#31
bloodusmc Regular 03 Mustang V6 Join Date: May 2009 Location: NJ Posts: 142 iTrader: 0 reviews	I have a V6 03 mustang Straight Pipes with Flowmasters 44. I am at the shop now he removed the 4 cats and kept the front sensors. BTW. Do cops check under the car lol. Never heard of that before. __________________ Semper Fi!

June 19th, 2009, 06:05 PM	#32
2002 BLK GT Hardcore Enthusiast 03 Mach 1 & 02 GT *************** Join Date: Apr 2009 Location: S. California Posts: 2,178 iTrader: 0 reviews	They have something with mirrors so they don't have to get under it... How much is he gonna charge you? __________________ 2003 Mach 1 Procharged 500rwhp club

June 19th, 2009, 06:47 PM	#33
bloodusmc Regular 03 Mustang V6 Join Date: May 2009 Location: NJ Posts: 142 iTrader: 0 reviews	I never seen cops in my city do that. I hope they dont get me. How much is the summon for it? any points or court? he is charging me $80 with the pipes __________________ Semper Fi!

June 19th, 2009, 06:52 PM	#34
bloodusmc Regular 03 Mustang V6 Join Date: May 2009 Location: NJ Posts: 142 iTrader: 0 reviews	wow he just finished changing one and it sounds like a monster. Still second exhaust left. __________________ Semper Fi!

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