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zzzcool
CEG'er

Reged: 10/15/03
Posts: 79
Gutting main cat gain hp?
#772696 - 11/19/04 04:02 PM

Would I gain any hp if I have a gutted main cat?

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Stazi
Hard-core CEG'er

Reged: 11/18/00
Posts: 10015
Loc: The land of Vegemite and Foster's (Actually Livonia, MI)
Re: Gutting main cat gain hp? new
#772714 (Re: zzzcool) 11/19/04 04:21 PM

No, just terrible noise.

Gutting the main cat makes the flow through it turbulent.

You're better of removing it entirely and then installing a high flow resonator in the middle of the exhaust (which requires you to remove the POS stock one in the process).

More power is gained from gutting the precats on a V6, but that requires you to run a main highflow cat in order to pass emissions (if you're in a state that gets tested).

--------------------
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set

A lack of planning on your part does not constitute an emergency on mine!

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GTO PeteModerator
Hard-core CEG'er

Reged: 04/07/01
Posts: 5975
Loc: Rockville, Maryland
Re: Gutting main cat gain hp? new
#772715 (Re: zzzcool) 11/19/04 04:24 PM

Trying searching (and posting) in the correct forums - discussed many times.

--------------------
Capitol CEG Classifieds
Make an offer!

2005 GTO IBM - 337hp/336tq

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HITMANinMI
Hard-core CEG'er

Reged: 09/30/03
Posts: 2725
Loc: Grand Rapids, Michigan - Chicago, IL
Re: Gutting main cat gain hp? new
#772847 (Re: Stazi) 11/19/04 06:45 PM

They are wrong, you will gain about 50hp, your car will be faster than a GTO, better 0-60 times than a Ferrari 355, yes gut that cat gain that hp.

Or use the search and find out the real answer.



--------------------
NEW CAR!!!!!!! 2004 Chevy Cavalier
-15k, 2.2 Ecotec, dark blue, sport package
GONE FINALLY -1996 Contour GL - Zetec - Auto - 76k

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jerseyca╚10
Hard-core CEG'er

Reged: 07/08/00
Posts: 1677
Loc: South Jersey
Re: Gutting main cat gain hp? new
#772862 (Re: HITMANinMI) 11/19/04 06:53 PM

Originally posted by HITMANinMI:
They are wrong, you will gain about 50hp, your car will be faster than a GTO, better 0-60 times than a Ferrari 355, yes gut that cat gain that hp.

Or use the search and find out the real answer.







Was the sarcasm really necessary here? He asked a legitimate question. Maybe it was in the wrong forum, and maybe he was in the wrong for not searching hard enough, but there is no excuse for your attitude. If you posts were 1/10th as relevant to ceg as his are, you might actually make a contribution around here once in a while.

--------------------
2005 Subaru Legacy | Ban Them Forever

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Pole120
Hard-core CEG'er

Reged: 03/16/04
Posts: 4141
Loc: New Berlin, WI
Re: Gutting main cat gain hp? new
#772865 (Re: jerseyca╚10) 11/19/04 06:56 PM

Originally posted by jerseycat10:
If you posts were 1/10th as relevant to ceg as his are, you might actually make a contribution around here once in a while.




--------------------
99 SE V6\5spd - 156 HP\157 TQ 15.166-90.84
Totaled 02/12/06

99 SVT # 1571 - 175 HP\153 TQ 14.999-91.88
Born 3/24/99 Reborn 3/18/06
Pietenpol Racing Technologies project vehicle

90 Festiva L 5spd, Blue(not for long), 103k

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Kremithefrog
I have no life

Reged: 05/14/02
Posts: 21653
Loc: Albany, Georgia
Re: Gutting main cat gain hp? new
#772867 (Re: HITMANinMI) 11/19/04 06:56 PM

How often do the other middle school kids beat you up?

--------------------
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)

FS: SVT rear sway bar
WTB: Very cheap beater

CEG Dragon Run - October 13-15

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Andy W.
b0x @dm1n

Reged: 07/19/00
Posts: 4397
Loc: Columbia, MD
Re: Gutting main cat gain hp? new
#772868 (Re: HITMANinMI) 11/19/04 06:57 PM

Originally posted by HITMANinMI:
They are wrong, you will gain about 50hp, your car will be faster than a GTO, better 0-60 times than a Ferrari 355, yes gut that cat gain that hp.

Or use the search and find out the real answer.






You really aren't good at posting. Please stop!

Starting off by saying two Veteran CEGer's are wrong isn't sarcasm it's an insult.

-Andy

--------------------
Andy W.
The problem with America is stupidity.
I'm not saying there should be a capital punishment
for stupidity, but why don't we just take the safety
labels off of everything and let the problem solve itself?


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Ronan
CEG'er

Reged: 05/24/03
Posts: 347
Loc: Ireland!!!!!
Re: Gutting main cat gain hp? new
#773568 (Re: Andy W.) 11/20/04 08:32 PM

I replaced my main cat with a straight through pipe. I didnt get it dyno'd b4/after etc, but I can tell you I felt the gain instantly. I dont know about top end, but I can tell you, you will notice the extra torque down low. I dont think the car lost anywhere from this mod.
I think the stainless pipe cost around $150, and it was the best bang/$ mod I have made to my car.
When I installed the more expensive stainless twin exhaust, I did notice the slight bit extra power, but nothing compared to the cheaper cat replacement pipe. When my car needs to be MOT'd, I just swap the cat pipe back in for the day.

--------------------
1996 Mondeo 24v 4-door
twin janspeed stainless pipe
cat by-pass
Phase 2 RS bodykit
16" cosworth alloys
K&N RU3530
SVT TB/UIM/LIM
poly bushings
konis/bat springs/bar
Pioneer
MSDS
Indiglos
P&P heads
2005 Mondeo Zetec Tdci

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EricF
CEG'er

Reged: 08/02/00
Posts: 326
Loc: Durango, CO
Re: Gutting main cat gain hp? new
#773916 (Re: Ronan) 11/21/04 06:01 AM

Mine is Gutted, no unusual noise is noticed.
I do have a Borla exhaust, and stock cats(headers)
Can't say I noticed a ton of improvement, but before
I gutted it I hadn't driven the car in 8 months.

I will most likely be putting in a straight pipe
in the spring, but its been like this for over a year.


--------------------
99 Cougar V6 Tourmaline Green: MTX, KKM, Borla Dual...

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