4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Removing cats??

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Old 06-02-2005, 02:15 AM
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freeunit
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Default Removing cats??

I was just wondering instead of removing your cats if you could just take them out a holo them out? My dad wont let me take them off so i was thinking i will just do the next best thing. Do you think it will make a difference in power and sound or will it hurt it? Also are the cats welled on or are they clampted some how? Let me know what you think about this idea..
Thanks.
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Old 06-02-2005, 02:44 AM
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Cajun
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Default RE: Removing cats??

You will get alot more high end hp about 20hp.. But your motor will have no back pressure and may die when cold..
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Old 06-02-2005, 02:48 AM
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IWinULose
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Default RE: Removing cats??


ORIGINAL: freeunit

I was just wondering instead of removing your cats if you could just take them out a holo them out? My dad wont let me take them off so i was thinking i will just do the next best thing. Do you think it will make a difference in power and sound or will it hurt it? Also are the cats welled on or are they clampted some how? Let me know what you think about this idea..
Thanks.

It'll definitley not be the best sound you have ever heard. Think coffee can with exhaust running through it. Gives a hollow sound. [:'(]
As far as being welded or clamped... if they are factory they are welded, of course. You will notice a horsepower gain. 20HP? That is stretching it.
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Old 06-02-2005, 02:58 AM
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The02GT
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Default RE: Removing cats??

It will sound better and u will notice power up top, they r welded in so u will have to cut and re-weld, and it will give u ABOUT 5 hp IF that, not 20...
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Old 06-02-2005, 11:33 AM
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Acer2428
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Default RE: Removing cats??


ORIGINAL: Cajun

You will get alot more high end hp about 20hp.. But your motor will have no back pressure and may die when cold..
haHAHAHAHA...

The difference will seriously be no more than 4-5hp, IF THAT. And it'll sound like poo.
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Old 06-02-2005, 12:34 PM
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97STANG
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Default RE: Removing cats??

why would it sound bad? it would pretty much be the same as an o/r h pipe. it will just have the factory 2 1/4' pipe instead of most aftermarket 2 1/2" pipes. You will definately hear your flowmasters more. i say go for it. you will have to get MIL's on there though....
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Old 06-02-2005, 02:16 PM
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Acer2428
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Default RE: Removing cats??

b/c of the empty cat shells in there. Instead of flowing smoothly through like an O/R pipe, the sound bounces around in there. It's def. louder than having cats, but a guy in the club did it and ended up just buying an O/R pipe since he hated the sound so much.
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Old 06-02-2005, 03:08 PM
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MikeHawke
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Default RE: Removing cats??

ORIGINAL: Acer2428

b/c of the empty cat shells in there. Instead of flowing smoothly through like an O/R pipe, the sound bounces around in there. It's def. louder than having cats, but a guy in the club did it and ended up just buying an O/R pipe since he hated the sound so much.
exactly, it will act like a resonator. [:'(]

....not to mention the fact that you have FOUR of them.
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Old 06-02-2005, 03:48 PM
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mustang_montana
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Default RE: Removing cats??

my car came with no cats, so i had to put some on to get it inspected. i have 2 magnaflow 3 " cats in my o/r h pipe and it sounds very good with my lm2s. id go with highflow cats if you can afford them.
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Old 06-02-2005, 05:09 PM
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freeunit
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Default RE: Removing cats??

how much do high flow cats cost
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