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high flow cat make zorst louder? 

 

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 Post subject: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 4:52 pm 
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Got a hurricane zorst on my ba turbo, its only from just infront of the diff back to the tips, from the standard upgraded 2 1/4'' twin system to now 2 1/2'' with smaller resonator in it and louder muffler, so sounds pretty good now, but a mate tells me that putting high flow cat on will make it a lot louder .... which im okay with!

wandering if its true?

also puttin on 4'' dump pipe will that do much to the sound aswel?

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 5:05 pm 
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if your going from a 400cpi cat to a 100cpi cat then yes it will be louder..

i hollowed out my 200cpi cat the other day as it had collapsed,(got a replacement coming) and going from a 200cpi to a straight through cat has made the car extremely loud..
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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:10 pm 
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thanks for that thats sweet, cuz im wandering why mine seems a bit too quiet... what does cpi mean? is the smaller the cpi the louder? so maybe i should specify a 100cpi when i get it? and im guessing the stock is 400 cpi?

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:24 pm 
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cpi is sells per inch,
100 cpi has larger cells/holes= more flow,
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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:26 pm 
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can u get much less then 100cpi and still be legal?

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:27 pm 
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mine has no cat, because we don't need them and its no loud. but might be different with boost
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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:28 pm 
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you dont need em troy? where the hell you from lol?

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:30 pm 
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new zealand, its not law YET
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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 13, 2010 10:37 pm 
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aha lucky mofo, it soon will be becuz i woulda thought its for like emissions and stuff so u need them pretty strictly

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Mon Jun 14, 2010 2:58 pm 
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was doing more research about 100cpi cats and i hear the make the car raspier/ more tinny if thats a word lol... but i like to still keep my deep note, or do u think for a big 4.0 engine it wont make it too tinny? anyone elses sound still good with high flow cat?

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Mon Jun 14, 2010 4:43 pm 
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I have a 200 cpi CAT on my exhaust with only one muffler, and its a little on the loud side. Maybe 10-15% louder than I would idealy have it. But yes, the low cpi CAT's do give you a very different note, better than the 400cpi in my opinion, doesnt sound like your car has a doona stuffed up the tailpipe.

It definately sounds more racey, agressive, raspy up high in the revs. Still sounds bassy and rumbly down low. Mine changes note at about 2800-3000 rpm goes from growl to howl, and then to wail from 4000 onwards. Its not a big CAT either, in respect to shape... its cylindrical, and only marginally bigger than the exhaust itself in diameter. The stock one was kinda square-ish in shape.

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Mon Jun 14, 2010 10:11 pm 
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i have no cat and it makes things alot louder!
at the moment i have just a standard exhaust with no rear muffler and first muffler replaced with a resonator and even that is pretty loud.
my other system is 2.5" with a flow muffler and a resonator and thats loud as f**k
if i have just one muffler like most aftermarket cat backs it would be silly loud lol
the cat def makes a fair difference

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Tue Jun 15, 2010 11:07 pm 
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thanks for the sweet replies guys,

so ill definately try get my hands on a 100cpi cat i think, should make it nice n loud :)

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Fri Jun 18, 2010 4:40 pm 
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it might sould like a deisel patrol for a month but after that it will sound horn..

 

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 Post subject: Re: high flow cat make zorst louder?
Posted: Sun Jun 20, 2010 11:30 pm 
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104ord wrote:
it might sould like a deisel patrol for a month but after that it will sound horn..


haha okay ill make note of that lol, becuz i hate the sound of them things

 

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