Jump to content
SAU Community

Recommended Posts

I've heard a fair bit of talk about hollowing out/punching out the CAT in the hope of gaining some power. Now to me this sounds highly illegal given emission laws but I'd think it'd be hard to tell if done right? Has anyone done this themselves, if so what process, did you open the cat or remove the insides through the holes, did you gain any power? What are the risks etc etc.

Cheers

Well, Looks like all of my original questions have been answered so thanks for all who posted. I think I'll pass on doing this given the balance of the pro's/con's equation. Not really keen on black build up on the rear bar nor do I want the unwanted attention that a flaming exhaust would bring. Environmentally, in all honesty this doesn't phase me, if I was that conscious of the environment I wouldn't drive a Turbo 6, I'd take public transport or drive some kind of rice burner 1.3L - 6L/100k's type car, but I do understand the point of that remark and appreciate the time taken to respond. The fines issue does concern me but I've never heard of someone being handed a 9-10k fine for an infringement, this is not to say that the fine does not exist. The worst I've seen/heard of was 2k for failing an emissions test and of the associates I have with modified cars, only two have ever had to take the car to be tested and they were highly modified examples, and obviously so.

Once again, thanks all for the time taken to respond, I've not seen this topic before and did try searching for it before posting, as I think 'most' of us do :P

Cheers

  • Replies 74
  • Created
  • Last Reply

Top Posters In This Topic

From the NSW Clean Air—Motor Vehicles and Motor Vehicle Fuels) Regulation 2002

17 Removal or adjustment of anti-pollution devices

(1) The owner of a motor vehicle who uses the motor vehicle, or causes or allows it to be used, is guilty of an offence if:

(a) an anti-pollution device had been fitted to the motor vehicle, and

(b) at the time of that use the device had been:

(i) removed, disconnected or impaired, or

(ii) adjusted or modified and the adjustment or modification results in the emission of excessive air impurities by the motor vehicle.

Maximum penalty: 400 penalty units in the case of a corporation, or 200 penalty units in the case of an individual.

....but I can't find the current value of a penalty unit :P

I had a straight threw bit of pipe like they sell on ebay as a racing cat the car came with it . I took it out and put a hiflow cat on there. Apparently they can tell (Qld Transport or Police) weather you have had your cat punched out buy putting a probe on the end of the exhaust. so you will get caught either way. Feel free to correct me if im worng :P

I had a straight threw bit of pipe like they sell on ebay as a racing cat the car came with it . I took it out and put a hiflow cat on there. Apparently they can tell (Qld Transport or Police) weather you have had your cat punched out buy putting a probe on the end of the exhaust. so you will get caught either way. Feel free to correct me if im worng

yeah, it works in the same way an o2 sensor does. just reads different things.

Pretty sure a penalty unit is $550.00

Makes it $11,000.

Adrian

Something went wrong in your calculation there Adrian, $550x200=$110,000.

I thought one penalty point =$110 in NSW, so 200X$110= $22,000.

Something went wrong in your calculation there Adrian, $550x200=$110,000.

I thought one penalty point =$110 in NSW, so 200X$110= $22,000.

I'm still all b'day partied out from the weekend. ;)

Good job! :P

"It's got a cop motor, a 440-cubic-inch plant; it's got cop tires, cop suspension, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas. What do you say — is it the new Bluesmobile or what?"

Anyone who is seriously dumb enough to take a guttered of piped cat over the pits deserves to be fine for sheer stupidity. I had a piped cat for around 2 years. Did the cop check it..... Nope. but i took it over before going ober the pits. NO COP will pick and be able to prove u have a piped or guttered cat. If they tap and its hollow u just say it must have come out over time (which does happen). If it piped well then u havnt really got a problem cause cops dont exactly carry around temperature guns all the time. And if u do pop a flame infront of a cop.... well ur an idiot.

piped cats are great. Had them before and got them on my car now. NOT one problem eva. (except if u leave any parts of the cat in there they smell like rotten eggs when they burn)

My mates have done it, one on a VL one on an r31 and gained alot of power for something that so far has cost them nothing, I warned them about the epa fine but has anyone actually ever witnessed this enforced? no one I know, but risk vs cost i'm going with a high flow cat mostly because im upgrading from 2.5" standard zaust to a greddy power extreme 3" stainless, but I cant see how a high flow 2.5" cat with the honeycomb interior even with the metal/ceramic inside could possibly flow better or give more power than a 2.5" cat with nothing inside, anyway if you really want to do it all you need is a screwdriver and a hammer pull of the cat, stick the driver inside and smash all the plastic honeycomb until its in bits small enough to shake out, my mates cars sound GOOOOD! to0! :P

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
    • Hi.. Just another problem. So maybe you can help. I(my mechanic) done swap from my RB20DE NEO to RB25DET NEO. Everything is OK but we have a boost cut. Coils/Plugs are ok...AFM is ok. ECU is ok. I have Walbro 255 but it "changed" sound few months ago(you can hear it ouside) you did not hear that when it was new(maybe faulty?) Sooo...what now? What can cause this boost cut? It is even when you standing still...
×
×
  • Create New...