10-20-2004, 05:49 PM
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#1
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AF Regular
Join Date: Oct 2004
Location: Sacramento, California
Posts: 61
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hollow out the cat?
i wanted to give my Z an more aggresive tone and was wondering if hollowing out my cat would be a good way, plus the obvious hp gains. It would be a good combo with the 17 SS wheels with 315s on the rear im bouta get. I have flowmaster now and yea it sounds good but i want it louder. Or if anybody has any good ideas bout what i should do to make it louder?
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10-20-2004, 05:55 PM
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#2
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AF Enthusiast
Join Date: Mar 2004
Location: Upland, Nebraska
Posts: 167
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Re: hollow out the cat?
change to MagnaFlow.
__________________
Black '97 Trans Am WS6 Smoked!
Rice is the perfect side dish! 
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10-20-2004, 06:29 PM
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#3
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AF Regular
Join Date: Oct 2004
Location: Sacramento, California
Posts: 61
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Re: hollow out the cat?
think that muffler will make a big difference? and how much would it be?
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10-20-2004, 07:41 PM
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#4
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AF Enthusiast
Join Date: Dec 2003
Location: Toronto
Posts: 1,421
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Re: hollow out the cat?
hollowing out the cat sucks balls and will make it have a crappy echoing kind of sound because it would act like a big fart can muffler.
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10-20-2004, 11:01 PM
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#5
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AF Enthusiast
Join Date: Mar 2004
Location: Upland, Nebraska
Posts: 167
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Re: hollow out the cat?
I have MagnaFlow and love it...it would make a big difference. don't know right off the top of my head how much it is.
__________________
Black '97 Trans Am WS6 Smoked!
Rice is the perfect side dish!
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10-20-2004, 11:02 PM
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#6
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AF Enthusiast
Join Date: Mar 2004
Location: Upland, Nebraska
Posts: 167
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Re: hollow out the cat?
oh and don't hollow it out just take it off and patch it with pipe.
__________________
Black '97 Trans Am WS6 Smoked!
Rice is the perfect side dish!
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10-20-2004, 11:03 PM
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#7
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AF Enthusiast
Join Date: Aug 2004
Location: Houston, Texas
Posts: 209
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Re: hollow out the cat?
Yeah, hollowing out the cat is a bad Idea....I really don't like the way mine sounds and I don't have any cats
__________________
97 Z28
C.A.I. Edelbrock shorties,all free mods,Borla's,MSD,LT4 timingchain, 1.6r/r,LT4 cam, NGK,p&p heads,ported maf ,52mmTB adj fuelpressure reg.,373's,pcm tune by pcmforless, all poly bushings,spohn t/a, s/t brace, etc. What I don't have..no egr no air pump and no cats
Well dip me in chocolate and
throw me to the lesbians!!!!!
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10-20-2004, 11:05 PM
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#8
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AF Enthusiast
Join Date: Aug 2004
Location: Houston, Texas
Posts: 209
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Re: hollow out the cat?
Borla's sound better on an LT1 IMO
__________________
97 Z28
C.A.I. Edelbrock shorties,all free mods,Borla's,MSD,LT4 timingchain, 1.6r/r,LT4 cam, NGK,p&p heads,ported maf ,52mmTB adj fuelpressure reg.,373's,pcm tune by pcmforless, all poly bushings,spohn t/a, s/t brace, etc. What I don't have..no egr no air pump and no cats
Well dip me in chocolate and
throw me to the lesbians!!!!!
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10-21-2004, 12:23 AM
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#9
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AF Regular
Join Date: Oct 2004
Location: Sacramento, California
Posts: 61
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Re: hollow out the cat?
is the Borla exhaust adjustable, cuz thats what i heard?
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10-21-2004, 12:40 AM
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#10
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The President
Join Date: Nov 2003
Location: Willoughby, Ohio
Posts: 5,369
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Re: hollow out the cat?
i think so
__________________
  
1986 Fiero
1990 300ZX TT
1991 Camaro RS 355
1998 Tahoe 4x4
1999 F355 Spyder
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10-21-2004, 12:49 AM
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#11
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AF Enthusiast
Join Date: Aug 2004
Location: Houston, Texas
Posts: 209
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Re: hollow out the cat?
Ye, it comes with different size restricter plates
__________________
97 Z28
C.A.I. Edelbrock shorties,all free mods,Borla's,MSD,LT4 timingchain, 1.6r/r,LT4 cam, NGK,p&p heads,ported maf ,52mmTB adj fuelpressure reg.,373's,pcm tune by pcmforless, all poly bushings,spohn t/a, s/t brace, etc. What I don't have..no egr no air pump and no cats
Well dip me in chocolate and
throw me to the lesbians!!!!!
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10-21-2004, 11:13 AM
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#12
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AF Fanatic
Join Date: Oct 2003
Location: fredericksburg, Virginia
Posts: 3,262
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Re: hollow out the cat?
gutting the cat increases the flow of exhaust by a lot, but it doesnt work as well as straight piping because the hollow cat basically works as an expansion chamber for the gases...
__________________
*Better power-to-weight ratio than a C6 corvette*
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10-22-2004, 07:47 PM
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#13
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AF Enthusiast
Join Date: May 2004
Location: salt lake city, Utah
Posts: 914
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Re: hollow out the cat?
Unless you live in AK , hollowing out your cat will make you fail emissions , You don't gain HP with no back pressure either , lose at most. I am running around right now with only a Y-pipe on my 3rd gen and it makes all my other mods seem obsolete. 0-back pressure = Horrible performance.
__________________
I love rice so much , I eat it daily. Yum yum Civic.
1992 RS Camaro 383.
2004 Mazda 6.
2003 Subaru Legacy GT Limited.
1984 Nissan 300 ZX
1993 Mazda MX-3 ( Newest addition to my collection. )
http://photobucket.com/albums/y187/ohjiro
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10-22-2004, 11:30 PM
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#14
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AF Regular
Join Date: Feb 2004
Location: wharton, Texas
Posts: 132
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Re: hollow out the cat?
Want loud exhaust? SLP loud mouth. Cost: 385-450. Leave the cat alone.
__________________
03 ram quad,4.7, a5, patriot blue, stock
99 Z28 5.7ls1, a4, black, Harwood 3" Cowl hood,FRA,GMMG cat-back 283rwhp/297rwtq b4 cat-back
91 RS camaro, 5.0, a4, teal blue, stock ( race project, no stock times yet)
76 c-10 stepside, 355/350, orange and rust, beater truck 
My Cardomain site: http://www.cardomain.com/ride/651308
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10-22-2004, 11:41 PM
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#15
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AF Regular
Join Date: Oct 2004
Location: Sacramento, California
Posts: 61
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Re: hollow out the cat?
is that SLP loud moth cat-back? well i used to have a 90 5.0 and i had no cats, then i had to smog it, which meant i had to put the cats back on and when i did i noticed a whole lof of restriction... so i thought on my camaro it would do the samething if i took the cat off
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