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#1
10-20-2004, 05:49 PM
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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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#3
10-20-2004, 06:29 PM
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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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#5
10-20-2004, 11:01 PM
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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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#7
10-20-2004, 11:03 PM
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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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#8
10-20-2004, 11:05 PM
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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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#9
10-21-2004, 12:23 AM
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Re: hollow out the cat?
is the Borla exhaust adjustable, cuz thats what i heard?
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#11
10-21-2004, 12:49 AM
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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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#12
10-21-2004, 11:13 AM
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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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#13
10-22-2004, 07:47 PM
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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.
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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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#14
10-22-2004, 11:30 PM
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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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#15
10-22-2004, 11:41 PM
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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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