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100 or 200cpi cat? 

 

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 Post subject: 100 or 200cpi cat?
Posted: Wed Jun 15, 2011 9:39 pm 
Parts Gopher
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g'day guys, Iv been running the standard cat with pacey 4480's and an auspac catback for the last year or so. Car makes a great sound, nice and deep and doesnt drone however the cat just shat itself.
Im looking at a hi flow , but im not sure whether or not to go 100 or 200cpi. Someone mentioned that the 100 sounds slightly more tinny?

cheers

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Wed Jun 15, 2011 10:12 pm 
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glad to hear im not the only one mate ;)
I was just gonna go the 100cpi because its the best flowing but i dont want to ruin the exhaust note at the same time

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 8:46 am 
Getting Side Ways
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The 100cpi Cat is illegal.
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 9:10 am 
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i just had a 2.5" mandrel bent cat back with 1 muffler, standard cat and standard manifold. sounded good.
but then i got a set of extractors. was gunna just fit them with the standard cat, but turns out the catalyst had cracked. so i got a 100cpi cat fitted.
then over 2500rpm it sounded like one of those B&S utes with no exhaust, terrible
so i had to get a resonator fitted. but now it sounds good again. and goes alot better.

the moral to my rambling is it may make it sound a bit tinny. so be prepared to maybe have to install another small resonator

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 10:04 am 
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the 100 cpi cat is a cat you have when you dont really want a cat..lol
100cpi is illegal, and your exhaust will almost smell like it has no cat, i know mine does..

imo a std 2 1/2" or even a 3" cat is enough for a std or slightly modified 4.0l..
if you want the "i got a high flow cat image" then the 200 cpi will do the job..

100 cpi is really only good for boosted applications, in some cases overkill..
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 2:15 pm 
Parts Gopher
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cheers for the responses guys, i got quoted $260 for a 200cpi redback today so it looks like that might be the go.
Hopefully it doesnt alter the note to much

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 2:29 pm 
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why not try venom exhaust works, they are a site sponser,
there 2 1/2" 200cpi cat is $180.

ive had better results with these cats then i have with other more expecsive cats..


venom-exhaust-works-f74/venom-high-flow-cats-t96173.html
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 3:22 pm 
Getting Side Ways
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TROYMAN wrote:
why not try venom exhaust works, they are a site sponser,
there 2 1/2" 200cpi cat is $180.
ive had better results with these cats then i have with other more expecsive cats..

venom-exhaust-works-f74/venom-high-flow-cats-t96173.html

And yet, Joe from CMS recommends Magnaflow?
http://www.magnaflow.com/
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 3:32 pm 
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Papa Smurf wrote:
TROYMAN wrote:
why not try venom exhaust works, they are a site sponser,
there 2 1/2" 200cpi cat is $180.
ive had better results with these cats then i have with other more expecsive cats..

venom-exhaust-works-f74/venom-high-flow-cats-t96173.html

And yet, Joe from CMS recommends Magnaflow?
http://www.magnaflow.com/


im not keen on the magnaflows..the last 2 magnaflow metal cats i had fell apart, the last ones center become dislodged and blocked my exhaust 1 week after its 12 month warranty expired, might be a differnt story for a n/a application... so i opted to try the venom cat.. more than a year later and still good. :)
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 6:56 pm 
Getting Side Ways
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yeh. my exhaust stinks lol. but i just did it for the high flow lol.

 

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Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 6:58 pm 
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My 100 cell cat didnt stink.

Everyone said they already smelled bad so I ripped it out and it was much, much worse.

The free 20rwkw was nice though. :)
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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 7:00 pm 
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Wouldnt a 3" cat on a 2.5" exhaust flow abit better?

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 7:01 pm 
Getting Side Ways
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yeh. until it hits the 2.5" exhaust. lol

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 7:09 pm 
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WILDEB wrote:
yeh. until it hits the 2.5" exhaust. lol



And there's the backpressure that you wanted ;)

 

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 Post subject: Re: 100 or 200cpi cat?
Posted: Thu Jun 16, 2011 7:45 pm 
Getting Side Ways
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Waggin wrote:
WILDEB wrote:
yeh. until it hits the 2.5" exhaust. lol



And there's the backpressure that you wanted ;)


may as well just get the 2.5" inlet-2.5" outlet type i have. but the body and catalyst on the inside is about 4"

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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