how many cat converters on a ralliart magna? is a 100cpsi cat much of an improvement in power and flow over a stock ralliart cat?
cheers guys

Only one cat in 3rd gen magnas, 100cpi cat is a little bit of an improvement over the stock item.

5 kw ?

Some will claim 5 Kw if they are selling them, others that don't sell them may claim 0Kw.

My guess is it will help a little but not 5Kw?

With any high flow cat, especially 100CPI though you will get a lot more noise over standard.
Some people will say more noise must mean there is less restriction, which therefore free's up power??

I don't know about the above, but if you want a good High flow Cat at a great price go for the Ballistic Cat here in NSW. Can get them from Sureflow in Ingleburn at $170.

After fitting a high flow cat you may need to look at other exhaust changes if your exhaust is currently as loud as you want.

I needed to add a resonator to mine.

Good quality, well made, look good.

umm arent 100cpi illegal? 200cpi is a legal minimum i believe

Yes 100 CPI are illegal, and even 200 CPI may be illegal also.

I'd recommend 200 CPI as a safer option (which Ballistic stock at same price).

any idea on fitting cost Brett?

you bought your car 2nd hand right? how do you know it hasnt already got a 100cpi cat in there? u dont... all this talk of illegal this, illegal that.. what do you do when you buy a 2nd hand car? take the cat out count the cels?

IM MY OPINION buy whatever you like mate... aslong as youve got a cat i cant see you ever having an issue... running no cat at all then your asking for trouble.. ive always personally fitted 100cpi when going aftermarket .. end of the day, you say you have no idea what cat it is, you bought the car that way...

you are welcome to your opinion gremlin, but dont give it out as advice on a public forum

@OP
1) 1 cat
2) people claim improvments, all the research ive looked at shows no noticible differance performance wise ( im guessing thats what your going for)
3) if your goona spend your dollars modding your ride, do it right - installed properly, and keep it legal ffs, dont give the iunsurance companys any reason to not pay you

thanks guys...didn't even realise that any of these cats were illegal...
do not want to do anything to stop an insurance claim

95ts.. hence the upper case "in my opinion"

im not really advising you to make your car illegal.. my point was more that there would be alot of illegal cars on the rd and the owners wouldnt even be aware due to buying the car 2nd hand....

the other thing is putting a 100cpi cat on your car is not a safety issue and does not fall under the road safety act.. its an epa issue in regards to emissions.. having steve knight reflash your factory ecu is just as "illegal" as fitting a 100cpi cat.. both mods may still see your car pass an epa emission test and both could also see your car fail and epa emission test..

a 200cpi cat is no more legal or illegal than a 100cpi.. both could fail an epa emission test just the 200cpi cat is less likely too..

as soon as you muck around with intake, exhausts and/or ecu tune your car could fail an epa emission test

k&n oiled pod filters are a complete no no according to the epa but we all seem to do it and its plan obvious by just popping the bonnet..

i do not claim any of the above to be fact and are just my opinions

read your local epa mod docs and decide for yourself whats right and wrong :)

Fitting of a cat depends who you use.

I was recommended to go to a guy in hoxton park (a few AMC guys use him), and he charged me $50 fitting (after buying a Ballistic for $170, so total $220).

Needless to say I was very happy after another place quoted me "about $600-$650 to supply and fit a high flow cat".


If you want his details PM me.

i just thought i would pose the q for the OP/. I personally couldnt give 2 craps. Im with gremlin, my car is plenty illegal enough i doubt they would even bother getting to an emissions test before defecting it for the million other things you can see with the naked eye. More too the point. YOu arent going to see any gain from a 100cpi to a 200cpi and ill stake my left nutt on that. Not in a magna on stock tune anyways

i just thought i would pose the q for the OP/. I personally couldnt give 2 craps. Im with gremlin, my car is plenty illegal enough i doubt they would even bother getting to an emissions test before defecting it for the million other things you can see with the naked eye. More too the point. YOu arent going to see any gain from a 100cpi to a 200cpi and ill stake my left nutt on that. Not in a magna on stock tune anyways

Defects for mods and defects for running no cat or a cat thats isnt approved are two different things mate. One of them attracts a fine that is many thousands of dollars and the other not so much. Can you guess which one?

Defects for mods and defects for running no cat or a cat thats isnt approved are two different things mate. One of them attracts a fine that is many thousands of dollars and the other not so much. Can you guess which one?

dont u get that mucking around with the intake and reflashing your ecu could make your car fail an emissions test.. just like having a 100cpi cat could....

anyway, i bought my car 2nd hand as it is.. so i didnt no the cat was a 100cpi.. prove im lying? or should ppl who actually didnt no be hit with 10k fines (or whatever the go is)?

dont u get that mucking around with the intake and reflashing your ecu could make your car fail an emissions test.. just like having a 100cpi cat could....

anyway, i bought my car 2nd hand as it is.. so i didnt no the cat was a 100cpi.. prove im lying? or should ppl who actually didnt no be hit with 10k fines (or whatever the go is)?

No, bypassing EGR or fitting a decat is a direct violation according to EPA, not just the road authorities

where did i mention bypassing the egr or fitting a decat?

i know the difference what im saying if there is a cat in place, with all my other mods im unlikely to ever be bothered about an emissions test, and even if i fail the only way to cop a stupid massive fine is to have intentionally modified the system (hollowed out the cat) where as using a adr approved cat that doesnt cut the mustard (some 100cpi are adr approved) is only going to see a defect

The EGR and cat are both very specific in the eyes of environmental agencies. Sorry, no mention of decat i know, but most 100CPI cats are not approved.

What i am getting at is advice given on this forum could land someone in hot water. I have seen it before and no doubt will happen again.

Guys this discussion is getting out of hand - the OP does not want any illegal advise see below ↓

thanks guys...didn't even realise that any of these cats were illegal...
do not want to do anything to stop an insurance claim

That being said - if you're cat converter was busted - would it be a cheaper option to buy a 200cpi cat instead? Mine seems to be on its way out because it has quite a repungent smell and mitsubishi want over $300 for a new one. You cannot find these 2nd hand because they all wreckers give theirs to recyclers who give them a flat $130 for the cats.

High flow cat did no gain on my magna over stock just keep stock cat.

kurt, what cat did you try exactly?

kurt, what cat did you try exactly?

3 inch 200cpi high flow

3 inch 200cpi high flow

Brand? metal core, ceramic core?

Brand? metal core, ceramic core?

Forgot brand metal

I went old school and punched a star picket through the guts of mine lol. Done nothing - but i was well aware before I done that that modern cars need back pressure to properly run, unlike cars of the late 70's and 80's, where back pressure killed the power.

My hi-flow cat didn't do anything as far as i could tell... may have assisted when car was tuned into still making power 5500+ where as before it died at 5500. Mine is 2.5" 100cell venom metal core

well i disagree totally i removed the cat on my old 3.5 sohc and my current engine and it was a very noticible improvement, more throttle response, more torque across the board especially at high revs and better economy, unfortunately you guys are in aussie. Here in nz there is no legal need for it, and no emissions testing. Engines dont need backpressure thats a myth, exhaust gas exiting faster helps draw intake charge into the cylinder depending on overlap, obviously tuning to take advantage helps.

well i disagree totally i removed the cat on my old 3.5 sohc and my current engine and it was a very noticible improvement, more throttle response, more torque across the board especially at high revs and better economy, unfortunately you guys are in aussie. Here in nz there is no legal need for it, and no emissions testing. Engines dont need backpressure thats a myth, exhaust gas exiting faster helps draw intake charge into the cylinder depending on overlap, obviously tuning to take advantage helps.

Are you sure? http://www.transport.govt.nz/legislation/Vehicle-Emissions-Questions-and-Answers/

Yep. I'm on the De-cat/ Punched-Cat table.

I felt a difference, but that was because I also went too 3 inch straight through stainless piping.

In my case cat was the last link in the chain of exhaust upgrades, first i did muffler then extractors & finally 100 cell metal cat.

Cat was BY FAR the biggest gain, truly made the car so responsive. Not saying people with factory exhaust will feel the same gain as i did.

Also it makes no difference what cat you are running 100 or 200pci, its not illegal to have 100 cell cat, whats illegal is having car not complying with emissions. If you manage to pass emissions test with 100 cell cat well its legal. It quite obvious you have no chance with 100 or 200 cell cat. YOU WILL NOT get $10,000 fine for running 100 cell cat, law is quite clear offense only applies for cars with no cat converter. What you will get is a yellow sticker (in NSW) & you will have to do emissions test as well & you will never never pass it with cheap after market cat.

Are you sure? http://www.transport.govt.nz/legislation/Vehicle-Emissions-Questions-and-Answers/

these rules apply to vehicles first registered in nz after the rules came into effect (2008), they are not applying it retrospectively. and there is no emission testing procedure in the WOF test. also the cars are only tested on entrance into the country.

cat converter was the last bit to be changed on my car following complete exhaust upgrades as well was a 200cpi venom metal core stainless cat, car seemed to rev a bit more freely and a bit louder when gunning it, orig cat 280 thou k's on it tho well past its life but the ol TF is far from stock with other mods cams etc stock car unless your kms are getting up there id say not worth doing.



In my case cat was the last link in the chain of exhaust upgrades, first i did muffler then extractors & finally 100 cell metal cat.

Cat was BY FAR the biggest gain, truly made the car so responsive. Not saying people with factory exhaust will feel the same gain as i did..

NZ, the land of long white clouds and people dying of exhaust gas emissions. There is a reason a cat exists on ULP cars and that is to get rid of highly poisonous exhaust gasses. It does not take too many brain cells to know that.

NZ, the land of long white clouds and people dying of exhaust gas emissions. There is a reason a cat exists on ULP cars and that is to get rid of highly poisonous exhaust gasses. It does not take too many brain cells to know that.

Likes this. Also, robssei, correct me if im wrong but your car does come under scrutiny of the lowest form of emissions outputs going by that NZ govt website. Just be careful - blah blah blah dont need
Cat converter might not be so true after all

i am going through all of this with my new car. it runs 3 cats from factory, 1 before the turbo and 2 after. my car will still pass nsw epa guidlines if all 3 cats are removed and 1 high flow 3in 200cpi cat is added. most cars wont, mine will because it uses TG's from factory. so at idle and low load, it produces very little co / co2.

on another note, my old magna had no cat, and i noticed a difference. but it really stank. i mean nasty stink

NZ, the land of long white clouds and people dying of exhaust gas emissions. There is a reason a cat exists on ULP cars and that is to get rid of highly poisonous exhaust gasses. It does not take too many brain cells to know that.

also doesnt take to many brain cells to figure out NOT to breathe in exhaust gas, hope you can cope.


Likes this. Also, robssei, correct me if im wrong but your car does come under scrutiny of the lowest form of emissions outputs going by that NZ govt website. Just be careful - blah blah blah dont need
Cat converter might not be so true after all

Well i have gone through countless vehicle testing procedures and never had emissions testing applied. i have only gutted the cat, both flanges are intact so another can easily be installed IF testing does become mainstream, i did this intentionally. but with the speed of operations in government, dont expect that anytime soon. in the meantime ill live with better economy, more power and torque across the rev range and a better sounding exhaust. oh i recycle if that makes you feel better vlad?

i recently put on a lukey bolt on muffler which definately increased power in the hight end didnt sound much better that the vrx muffler, and have now just put on a 100 ci high flow cat (which is legal in qld) and i think i have lost a little torque but from 3000 and up its an animal and would still think its an inprovement in hp. car is a TL VR manual by the way

So just for clarification what CI is the stock cat in a TJ Sports? OR any other model for that matter. I am looking at getting a little more volume in my exhaust and I would like to keep my stock system.

Further to Bellto's comment about stink, I have a Pajero and a Tf Magna, both running on gas. The Magna is fine, but the Pajero stinks after a long hot run and then idle the best into the garage. Both vehicles are standard. The Pajero has always stunk since new. That applies to running on gas. Not sure about petrol.

So just for clarification what CI is the stock cat in a TJ Sports? OR any other model for that matter. I am looking at getting a little more volume in my exhaust and I would like to keep my stock system.

I think maybe 450cpi ceramic?

only difference i found with my 100c cat is smoother power then when i got the car tuned i think it made the top end a little stronger.

I think maybe 450cpi ceramic?

only difference i found with my 100c cat is smoother power then when i got the car tuned i think it made the top end a little stronger.

okay so if I perhaps wanted a ~%20 volume increase would a say 300cpi cat do this for me well? Dont really mind about the performance increases