cutting cats, info please - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 06-21-2006 Thread Starter
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cutting cats, info please

Car: 98 Mustang V6

I got true dual exhaust with dual flowmasters, but it really isnt that loud. I was wondering if any one here has cut the cats off of there v6?

First off how big of a deal is it to get them off and how much (i know its illegal, so can u get in any kind of sh*t for requesting someone 2 cut ur cats?)

Second, how much of an improvement is the sound?

Do you have to worry about backfire?

I know ur check engine light comes on, but any other problems with cutting off cats? Any good effects besides sound?

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post #2 of 5 (permalink) Old 06-21-2006
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Quote:
Originally Posted by Godlik3
Car: 98 Mustang V6

I got true dual exhaust with dual flowmasters, but it really isnt that loud. I was wondering if any one here has cut the cats off of there v6?

First off how big of a deal is it to get them off and how much (i know its illegal, so can u get in any kind of sh*t for requesting someone 2 cut ur cats?)

Second, how much of an improvement is the sound?

Do you have to worry about backfire?

I know ur check engine light comes on, but any other problems with cutting off cats? Any good effects besides sound?
You will lose a lot of hp/tq if you do

it's not a big deal, but no reputable shop will do it.

virtually none, the muffler is a bigger determinate of sound than the cats. swap mufflers if you want more sound.

Backfiring kills the cats, so if your car is backfiring, the cats are dead anyway. Backfiring has to do with engine tuning, not exhaust.

There are no good effects from removing the cats, no matter what the old wives say. The only situation in which you would have anything to gain is from either a highly modified engine making 250+ rwhp, or when using a power adder. The 3.8L/4.2L engine needs backpressure for torque production, and the cam isn't made to take advantage of higher flow. so you lose all the way around.


Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #3 of 5 (permalink) Old 06-21-2006
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Quote:
Originally Posted by kscoyote
You will lose a lot of hp/tq if you do

it's not a big deal, but no reputable shop will do it.

virtually none, the muffler is a bigger determinate of sound than the cats. swap mufflers if you want more sound.

Backfiring kills the cats, so if your car is backfiring, the cats are dead anyway. Backfiring has to do with engine tuning, not exhaust.

There are no good effects from removing the cats, no matter what the old wives say. The only situation in which you would have anything to gain is from either a highly modified engine making 250+ rwhp, or when using a power adder. The 3.8L/4.2L engine needs backpressure for torque production, and the cam isn't made to take advantage of higher flow. so you lose all the way around.
I had my cats removed... It sounds alot better... But make sure they leave the pre-cats on the car... that should give the car enough back pressure....I went with 2" pipes from the headers back with flowmaster 40 series......also they can move the 02 sensor, so the check engine light does not come on... thats what they did with mine...

02 stang, True Dual exhaust, CAI, 4.10 gears, 180 Thermostat, Diablosport tuned, dropped 2", Cross Drilled rotors, Zri Fuzion Tires, GT RSB + more
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post #4 of 5 (permalink) Old 06-22-2006
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Quote:
Originally Posted by Kmagn13
I had my cats removed... It sounds alot better... But make sure they leave the pre-cats on the car... that should give the car enough back pressure....I went with 2" pipes from the headers back with flowmaster 40 series......also they can move the 02 sensor, so the check engine light does not come on... thats what they did with mine...

You're running 2" so you're fine. Most folks are running GT Takeoffs or bigger.

The did you install the flows at the same time, or did you take off the cats before or after the flows?

Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17
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post #5 of 5 (permalink) Old 06-22-2006
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Quote:
Originally Posted by kscoyote
You're running 2" so you're fine. Most folks are running GT Takeoffs or bigger.

The did you install the flows at the same time, or did you take off the cats before or after the flows?
They did the flows before the cats...

02 stang, True Dual exhaust, CAI, 4.10 gears, 180 Thermostat, Diablosport tuned, dropped 2", Cross Drilled rotors, Zri Fuzion Tires, GT RSB + more
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