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

Link to comment
https://www.sau.com.au/forums/topic/131904-hollowpunched-out-cat/
Share on other sites

  • Replies 74
  • Created
  • Last Reply

Top Posters In This Topic

if you tap it with a spanner or something solid it will ting if its empty

so its pretty easy to tell if its been gutted

also youll have black crap on the rear bar where the muffler comes out

obvious signs of a gutted cut or "hi flow" special cat

Woah, that's steep... How would they know though? I was under the impression that it would look stock from the outside and if you get told to go do an emissions check you'd just replace it with a stock one?

i was thinking of the same thing for a while. then common sense hit in and i bought a hi flow. $360 vs $9k. i think it speaks for itself. from what ive been told u just crack it open at the welt joints gut it and weld it back up. if you can get a straight through pipe and then weld a 3" cat cover over it you will get more out of it.

yeh gutted standard one would flow better, but a hi flow one couldnt be much worse, considering larger size in and exit pipes (not adapted from 2 " to 3", and far better flow design.

Although you could always say youve never had it off and i cant see hoe they could prove it wasnt the last owner

someones a hippy.

Perhaps spend a few hundred bux and just buy a 4" cat and put that in instead, the extra size surely wouldnt restrict a 3" system. But i admit having cool flames from the sil80 when it was minus a cat was cool fun when doing mountain runs haha.

I believe they measure the temp before the cat and than after the cat, there should be a drop as it passes through.. also - it'll flame on backfire..

It's not worth it, there is other things you can do to get power that doesn't cost you $10k in fines..

You don't have too be a hippy at all too have a little respect.

Seriously, its generally accepted that not having a cat/gutting your gut with net you about 3-4rwkw - Really worth it.

Now......Time too pour my excess race fuel into Waragamba Dam.

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

    • Edit: It's now known as "R Performance" and is still in operation.
    • This lady loved her FD for 25 years!  https://www.topspeed.com/80-year-old-woman-donates-fd-rx-7-mazda/ My brother in law. He's nice enough to let me drive it whenever. He'll likely not see this, but I'll try: @r-is-for-fun got any pics?
    • Just something I found searching for more info on Emotion R, apparently the ECR33 Skyline GTS25t was either originally black, or there were two of them, the black one being the original demo car, then building a white one which was part of the 1997-onwards (to at least 2008!) Cockpit Tatebayashi Tokyo Auto Salon booth demo cars. It appears that Emotion R closed down in 2008 and was declared bankrupt in 2010: http://bank-db.com/hasan/208365. Scan of a magazine with the black R33 from 1996: Wayback machine archived page from May, 2000: https://web.archive.org/web/20000529061027/http://www.emotion-r.co.jp/skyline.html Option magazine with a few photos from the Cockpit Tatebayashi booth at the Auto Salon from various years: 2002: http://www.jdm-option.com/photo/index.php?action=item&category_id=154&image_id=3507 2003: http://www.jdm-option.com/photo/index.php?action=item&category_id=137&image_id=3033 2005: http://www.jdm-option.com/photo/index.php?action=item&category_id=116&image_id=1831 In 2008 Cusco website mentions that the Cockpit Tatebayashi ECR33 was displayed at that year's Tokyo Auto Salon: https://www.cusco.co.jp/event/2008/12/post_735.html As of 2021 it appears that the ECR33 demo car ended up being exported to Florida, USA: https://rmcmiami.com/inventory/1996-nissan-skyline-r33-cockpit-tatebayashi-demo-car-big-te06-turbo-endless-brakes-lsd-450hp/ And finally here's Google streetview of the Emorion R garage in 2023 which is amazingly not only still there, but the showroom is still full of various parts in stock and funishings, etc.: https://maps.app.goo.gl/ttyEAZdZLyzermyT9 Apologies for nerding out a bit. I used to love doing this 20 years ago on SAU and got a bit nostalgic for a moment... 馃槄
    • Try fabricating something like this and install it under the pedals? Not sure if it's legal or not....
    • Even though I have some pretty good (brand) ratchet ringies, I avoid using them to break open tight bolts. A broken ratchet is very annoying.
  • Create New...