to remove cats or not to?

kreymis · Sep 10, 2009

is it worth removing the cats on my setup. 331 w/ strim. i notice after mashing throttle sometimes i smell a sulfur odor. also when cruising on highway in 5th gear the mil comes on until i downshift and give it throttle. it runs fine. im wondering if the cats are loading up or something. should i remove them and will i see any performance gain being that its a forced induction setup?

HISSIN50 · Sep 10, 2009

What code(s) is/are being stored?

For off-road use only, you might find that an O/R pipe or even an aftermarket catted H-pipe will free thngs up a good bit.

revhead347 · Sep 10, 2009

Ditch those things. Cats are bad m'kay.

Kurt

final5-0 · Sep 10, 2009

Yes ... but maybe ... No

You don't say if you are talking about the OEM 4 cat mid pipe

If that is the mid pipe you are talking about it is very restrictive

A true high flow cat is not all that restrictive
but
Sure it would offer more restriction than nothing at all as in an OR pipe

IIRC ... The tests I've seen in the past say about .......
5 or less rwhp for the high flow cat mid pipe

Now

This was NA so a boosted app might could change things

Grady

fivemustangs · Sep 11, 2009

I would say ditch them also, unless you live somewere like california.... you can also make some good money off them. Sold all four of mine on ebay for close to 200 bucks, thats half of a new exhaust system!

kreymis · Sep 11, 2009

they are bbk high flow cats but i think they are hurting performance now that my setup has doubled horsepower.

revhead347 · Sep 11, 2009

All cats are restrictive as hell. They don't hurt your hp too much, but they murder your low end torque.

Kurt

kreymis · Sep 11, 2009

ive heard that removing cats will increase throttle response drastically. thats what im hoping for

revhead347 · Sep 11, 2009

kreymis said:
ive heard that removing cats will increase throttle response drastically. thats what im hoping for

It will definately do that.

Kurt

Adam95GT · Sep 11, 2009

I like cats.... I dont like my car sounding like a raped ape. I like the sound of the car with cats. Im drivign a car thats killing the enviroment already. At least i could put some cats on the damn thing. i know many people dont feel this way and will probably flame the **** out of me. But eh. whatever

GTA_V6_Mustang · Sep 11, 2009

Adam95GT said:
I like cats.... I dont like my car sounding like a raped ape. I like the sound of the car with cats. Im drivign a car thats killing the enviroment already. At least i could put some cats on the damn thing. i know many people dont feel this way and will probably flame the **** out of me. But eh. whatever

I agree with you.

94-302-vert · Sep 12, 2009

Adam95GT said:
I like cats.... I dont like my car sounding like a raped ape. I like the sound of the car with cats. Im drivign a car thats killing the enviroment already. At least i could put some cats on the damn thing. i know many people dont feel this way and will probably flame the **** out of me. But eh. whatever

Just kidding...

I like that cats quiet a car, and that they get rid of the smell of a car... However on my car I get a HUGE resonance with my Catco high flow catted H-pipe on it... No cats is quieter inside the car...

So it is up to you.

As far as going fron 4 cats to 2 high flow, then from 2 high flow to an O/R pipe I noticed the difference in both sound and power each time. This is on a stock NA engine with only an intake system...

Although every 2 years I run cats for a week...

revhead347 · Sep 12, 2009

Not having cats doesn't make it much louder if you have good quality mufflers.

Kurt

revhead347 · Sep 12, 2009

Adam95GT said:
I like cats.... I dont like my car sounding like a raped ape. I like the sound of the car with cats. Im drivign a car thats killing the enviroment already. At least i could put some cats on the damn thing. i know many people dont feel this way and will probably flame the **** out of me. But eh. whatever

I guess I take it for granted that I drive my Stang 500 miles a year, so it's not a polluter. I understand that point of view though.

Kurt

to remove cats or not to?

kreymis

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HISSIN50

"How long does it take to get help in here?

revhead347

Apparently my ex-husband made that mistake.

final5-0

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fivemustangs

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kreymis

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revhead347

Apparently my ex-husband made that mistake.

kreymis

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revhead347

Apparently my ex-husband made that mistake.

Adam95GT

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GTA_V6_Mustang

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94-302-vert

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revhead347

Apparently my ex-husband made that mistake.

revhead347

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