Will punching the guts out of my standard flow cat have adverse affects????

it is off now and i need to work at 5.

and will there be any positives if i do??

thanks

Will punching the guts out of my standard flow cat have adverse affects????

it is off now and i need to work at 5.

It'll still drive fine, it'll probably be a little louder and a little smellier. If you do this tho, you should get a new cat fitted as soon as you can as it's illegal to not have one, and it carries a fine last I checked, of around $10,000.

Will punching the guts out of my standard flow cat have adverse affects????

it is off now and i need to work at 5.

and will there be any positives if i do??

thanks

i'm all for cheap performance mods.....but in this case do it properly, spend the money on a high flow metal cat...or source a fresh used turbo Ford or later holden v8 job from an exhaust shop or wreckers.

holly crap, 10,000!!!! thats huge, is there any way to clean them?

will i get more power?

holly crap, 10,000!!!! thats huge, is there any way to clean them?

will i get more power?

Errr, no.

Spend the money and get a proper high flow cat. Won't be more than probably $350 fitted.

got quoted 850 by carline today:nuts:

and if there wont be any difference, why do people get high flow cats?
thanks

There will be a difference with a high flow cat.

Have a look at the reflash ecu threads to see that there is a real benefit on doing the job properly.

Gerry

got quoted 850 by carline today:nuts:

and if there wont be any difference, why do people get high flow cats?
thanks

$850??

Last time i bought a cat was like $280 and that was a 3" stainless high flow. If that quote was for genuine parts go aftermarket.

Should be alot cheaper than that, also if your doin a cat might aswell be a high flow one cause there wont be much difference in price.

EDIT: Cats on ebay ranging from around $100-$200

Just got a metal matrix cat this week, $390. Difference is that it's a 100 cell not 200, when I was researching them I found that alot of hi-flow cats were 200 cell, I'll find out in about 10 minutess if it made any difference

My bro bought 2x 4" 100cpsi Ballistic Racing Cats for $200 each from a group buy. I think the guy that organized it is still selling them but for $230 each.

think you'll find 100 cpi isn't street legal.

think you'll find 100 cpi isn't street legal.

yeh but you wont cop the 10k fine for no cat

if u get pulled up the worst is getting asked to do an emmision test...

think you'll find 100 cpi isn't street legal.

Don't have a clue what a CPI is... but if he ran then parallel would that equal 200?

but why? wouldnt it mean less flow?

CPI stands for cells per inch...

I heard it was $5000 per cylinder for no cat???? anyone???

Will punching the guts out of my standard flow cat have adverse affects????

it is off now and i need to work at 5.

and will there be any positives if i do??

thanks

punching out the guts of your cat can make your car run like crap...
fuel econ can turn really bad
emissions.. you would fail
exhaust would be a bit louder too.
not to mention the fine.

done this on old EFI ZL Fairlanes... and they run rich and LOUD without the cat on there.. diff car i know.. but still experience

I was assured by the place I got it that 100 cell was street legal, an the maximum fine for no cat is $22000

punching out the guts of your cat can make your car run like crap...


only because your exhaust is flowing so much better..the car would need a tune to be 100% right.... if the car was tuned with no cat it would go alot harder than tuned with a cat... the best cat is no cat.. one step, not far down from that, is a 100cpi cat

only because your exhaust is flowing so much better..the car would need a tune to be 100% right.... if the car was tuned with no cat it would go alot harder than tuned with a cat... the best cat is no cat.. one step, not far down from that, is a 100cpi cat
Yeh my mate has a decat pipe in his EvoIX. It drives much better but he's getting a tune next week to get the most out of it. He's also contemplating whether to go for an E85 tune or 100 octane tune lol

Yeh my mate has a decat pipe in his EvoIX. It drives much better but he's getting a tune next week to get the most out of it. He's also contemplating whether to go for an E85 tune or 100 octane tune lol

e85 is brilliant.. my only argument against it is where do u buy it!!!! its to hard to find for me atm..otherwise id go with it aswell

ive got a catdelete sitting here for an evo7/8/9 :)

dunno weither to sell it or keep it for track days..

100cpi cat made an awesome difference on my evo.. i can only imagine what going from stock cat to no cat would be like!! :)

if i made the cat flow better by drilling some half inch holes through it, would ressetting the ecu (removing, reinstalling) the battery cable give me any improvement?

by the way, i did a blockie with the cat totally removed, so the exhust stopped at around the drives door, it was sooooooo loud, put any rice tip to shame.

There will be no difference at all

can i ask why?

why wouldnt the computer think, hang on, my exhust flows better now, i will go fast?

i am just curious.

can i ask why?

why wouldnt the computer think, hang on, my exhust flows better now, i will go fast?

i am just curious.

bellto, ECU's run on a bunch of pre-programmed parameters according to temperature, load, RPM etc. If you want the full effect of installing a new cat, you really should have your ECU tuned.

ok, thats all i really wated to know.

thanks

Taking the cat out gained 6kwatw on my awd. Did I notice it? Only the extra drone. To keep Mr emissions happy I'm going a 200cpi Metalcat. Don't panic about an ecu tune/flash until you have enough mods that you're getting too far away from the factory parameters and performance is thus being restrained. The oem ecu can roll with much of what you can bolt-on, even a mild cam swap. For eg: My stock awd was good for 100-105atw from MMAL. With zorst and inlet manifold it made 123kwatw, with a tune 132kwatw. So there was 20kwatw (+20%) worth of untuned gains with a tune the gain was only 10%. Total gain of approx 30%. The more mods, the more viable the tuning is - both financially and powerwise/driveability wise.

* Yes I know quoting wot peak outputs does not represent the improvements possible at the other 70% of the tunable load settings.