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Old 11-24-2007, 10:30 AM   #1
scorcher2005
Scooby Newbie
 
Member#: 122548
Join Date: Aug 2006
Chapter/Region: South East
Location: Beaufort, SC
Vehicle:
06 WRX
WRB

Default gutted cat sound/performance

Well, since i have decided to pick up an 06wrx, i am probably going to put my old exhaust from the STi on it. Will i have a little bit more performance with a gutted cat? Will it sound terrible or no? The only reason i dont put a straight pipe on it is because im concerned w/ visual inspections, but there is no emmission tests.
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Old 11-24-2007, 10:40 AM   #2
scooby2.0t
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Member#: 127092
Join Date: Sep 2006
Chapter/Region: MAIC
Location: salisbury,MD
Vehicle:
2002 WRX WRB
05 Kawi ZX6R Plasma Blue

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I have no cats on my wrx and i passed the visual inspection in MD.
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Old 11-24-2007, 11:07 AM   #3
Knightmare69
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Member#: 25039
Join Date: Sep 2002
Chapter/Region: Tri-State
Location: Hong Kong/Dong Guan China
Vehicle:
2005 CGM Stage 2 WRX
SQC 275

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I had a gutted DP and 3rd cat on my 05 with a 3in CBE, the tone was slightly louder but not too bad, you do notice a difference.
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Old 11-24-2007, 11:55 AM   #4
Import Car Center
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Member#: 162594
Join Date: Oct 2007
Chapter/Region: TXIC
Location: Grapevine, Tx
Vehicle:
04 WRX STG 4+

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i didn't notice enough difference to make a big deal about it. only slightly louder and i can't feel any power difference.
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Old 11-24-2007, 12:23 PM   #5
Back Road Runner
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Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

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Yeah, the power difference is minimal unless you up what you're shoving through the engine. You might experience some very slight gain on top end, but for the most part, don't expect gains unless you're running higher boost/bigger turbo. It's simply that there is no gain until it becomes restrictive. That's it.
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Old 11-24-2007, 12:32 PM   #6
stil2stock
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Member#: 51870
Join Date: Jan 2004
Chapter/Region: MAIC
Location: Charlottesville, VA
Vehicle:
06 STI
WRB

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I'm catless and passed inspection in NC. I don't know how it works in SC, but I just chose the ishiest, run-down looking inspection station, and the workers there just either didn't give a crap or are real dumb.
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Old 11-25-2007, 01:52 AM   #7
Sweetnessinfall
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Member#: 165079
Join Date: Nov 2007
Chapter/Region: MAIC
Location: NoVa
Vehicle:
2015 WRX
Dark Grey Metallic

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Quote:
Originally Posted by stil2stock View Post
I'm catless and passed inspection in NC. I don't know how it works in SC, but I just chose the ishiest, run-down looking inspection station, and the workers there just either didn't give a crap or are real dumb.
you didn't pay them off?
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Old 11-25-2007, 11:14 AM   #8
stil2stock
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Member#: 51870
Join Date: Jan 2004
Chapter/Region: MAIC
Location: Charlottesville, VA
Vehicle:
06 STI
WRB

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Quote:
Originally Posted by Sweetnessinfall View Post
you didn't pay them off?
haha, no, didn't have to. The AP took care of the OBDII test, and the guy doing the visual glanced under the car and signed off on it.
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Old 11-26-2007, 12:43 AM   #9
scorcher2005
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Member#: 122548
Join Date: Aug 2006
Chapter/Region: South East
Location: Beaufort, SC
Vehicle:
06 WRX
WRB

Default

Well, i guess there are like 3 or 4 layers of the ceramic crap in there and only one was busted.
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Old 11-26-2007, 03:10 PM   #10
Pimpstarrs STI
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Chapter/Region: SCIC
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05 STI
Aspen White

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u can pass dont forget about the monoxide
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