ok im not too sure about this
i DO believe that there are different types of CATs
but what are they and how do they differ??
i know that a CAT is just something within the exhaust system that reduces the air polution out of your exhaust, but perfomance wise how do they effect a car.

ALSO what should i be looking at for my car, BRAND, CAT TYPE???
and rough prices?

P.S atm i have the stock CAT

Catalytic converter... stock or high-flow are your two standard types... Performance wise it can be seen as the restriction to the flowing of exhaust gasses, and most performance enthusiasts will replace it with a high flow catalytic converter to reduce restriction.

Catalytic converter... stock or high-flow are your two standard types... Performance wise it can be seen as the restriction to the flowing of exhaust gasses, and most performance enthusiasts will replace it with a high flow catalytic converter to reduce restriction.
Yup, and the fact that a stock cat is 4-500 easy, and you can pick up high-flows for as little as $250, i know which one i'd choose.

a lot of cats are claimed to be high flow but aren't really. to see if they are you need to find the flow rates. i know of highflow cats that have half the flow rates of other highflow cats.

a lot of cats are claimed to be high flow but aren't really. to see if they are you need to find the flow rates. i know of highflow cats that have half the flow rates of other highflow cats.
Yeh i've been told 200CFM is ideal for the magna.

yeah that is pretty low as far as flow rates are concerned. most cats should easily flow that.

for example this cat is $260 and flows 467cfm
http://bosimporting.com.au/index.php?page=shop.product_details&flypage=shop.flypage&product_id=19&category_id=2&manufacturer_id=0&option=com_virtuemart&Itemid=27

MEOW!!


lol also don't buy online, Goto a proper exhaust shop and actually have a look at the CAT before it goes in.

Cause if its the wrong one, its either not a high flow one or the insides will melt away if its the wrong design (ie; putting a CAT designed for a 4 banger onto a your V6)

Cause if its the wrong one, its either not a high flow one or the insides will melt away if its the wrong design (ie; putting a CAT designed for a 4 banger onto a your V6)
i have never heard of a cat melting before. and i have never heard of a cat being designed for a certain amount of cylinders before either.

i have never heard of a cat melting before. and i have never heard of a cat being designed for a certain amount of cylinders before either.
Yeah it happens believe it or not
know it sounds strange, but Midas put a "hi-flow" 2.5" CAT to replace my standard one on the verada (before S/C). 2 days later the car reaked of rotten egg. CAT was obviously the problem so took it back and they took it off.. the inside was completey hollow!!

Same thing happen to my mates VT SS.

Like I said don't go cheap and goto an actual exhaust shop.

the only 2 types i know are the ceramic cat, and the metal cat.... apparently the metal cats last much longer as the ceramic over the years can stuff up become clogged blocked melted... and when the ceramic is broken and you hear the awful vibration.... ahhh i hate that...

there is also a difference in how many lots of honeycomb they have in the centre. some have 2, others have 3

unless your cat is stuffed and you are going forced induction, i really dont believe you will gain anything having a hi-flow cat. I have heard from these forums and my own personal sources who have said the factory magna cats flow extremely well for a factory cat. I put a hi-flow cat on and a catback system and noticed zip, nunna zero other than a slight note change differance between those two and my factory system i took off(sports). Waste of money. in fact i ran a 15.3 1/4 before and after the system was put on. if you decide to do it, get a 3" metalcat cat.

unless your cat is stuffed and you are going forced induction, i really dont believe you will gain anything having a hi-flow cat. I have heard from these forums and my own personal sources who have said the factory magna cats flow extremely well for a factory cat. I put a hi-flow cat on and a catback system and noticed zip, nunna zero other than a slight note change differance between those two and my factory system i took off(sports). Waste of money. in fact i ran a 15.3 1/4 before and after the system was put on. if you decide to do it, get a 3" metalcat cat.

i noticed a gain when i replaced mine. got a 2.5" hiflow ceramic cat.

prettysure extractors are dumbed down without the addition of a highflow cat. could be wrong

i noticed a gain when i replaced mine. got a 2.5" hiflow ceramic cat.

prettysure extractors are dumbed down without the addition of a highflow cat. could be wrong

Sorry big 4...i shoulda mentioned in relation to 3rd gen 3.5's. i don't doubt they have their place in certain applications however from my experience and my mods there was no need to replace my cat or catback, thats why my opinion to the o.p for this thread would be to spend the money elsewhere like an intake manifold first.

Sorry big 4...i shoulda mentioned in relation to 3rd gen 3.5's. i don't doubt they have their place in certain applications however from my experience and my mods there was no need to replace my cat or catback, thats why my opinion to the o.p for this thread would be to spend the money elsewhere like an intake manifold first.

acknowelged

So... does anyone have a good stock one lying around? Mine's got a bit of the old death-rattle going occasionally, and am pretty sure it's choked up from stuffed valve stem seals (would have to replace these as well obviously).
But don't want to spend a couple of hundred on a cat!

So... does anyone have a good stock one lying around? Mine's got a bit of the old death-rattle going occasionally, and am pretty sure it's choked up from stuffed valve stem seals (would have to replace these as well obviously).
But don't want to spend a couple of hundred on a cat!

I have one right here, all packed up ready to go, It was my orginal one from my TR but upon inspection of one only 80K old they looked identical, my cat made no noises or anything.
$90 posted?

this is a bobbing bengal tiger(cat) for the rear parcel tray :badgrin:

:bowrofl: :bowrofl: :bowrofl:


Just so you know its actually illegal to replace a cat thats not new, even if its in better condition. Stupid really. When I got a cat back on my previous car, I asked if they had any cat's from like a near new HSV that they were gonna throw out, so i could put that on my car. Even though he said cat's usually dont do anything after 100,000km, he absoloutely refused to do it because its illegal. So I couldnt get a much better flowing car for better performance, meanwhile slashing my exahust emissions to save the environment, because of some stupid law. He reckons that guys import brand new corvettes and stuff and have onyl been driven onto the boat, but they have to throw the cats out and put two brand new ones in. But if you can do it yourself or find someone who can do it, I say go for it.

Ollie

Should of said otherwise and got an exhaust shop to put one on for you, besides who can tell if a 2nd gen magna's cat has been changed or not?

Agreed, thing is, its not even if it been changed, its just if when it was put on it wasnt new. I had already booked it in and they were quite helpful everywhere else, and wasnt sure if I could find a decent cat and installer to do it, though I still wanted to afterwards. At least they knew what they were talking about, the number of 'exhaust specialists/shops' that recommended I put a 2.5 inch exhaust on an old un-modified 92 Laser with a 1.6 litre carby engine made me shudder. Even though I knew I wanted a 2 inch, any place that thought otherwise was straight off the list.

Ollie