Thread: Exhaust specialist in South Brisbane

Cookies Exhaust in Wynnum has a good reputation.

I would imagine the V8 discos run O2 sensors either before or after the cats?
I'm not sure myself how they are setup, nor how the ecu handles the tuning, but won't getting rid of the cats effect the readings obtained by the O2 sensors , in turn affecting the way the engine operates?
Getting rid of the cats on my Commodore (chalk and cheese I know) required the ecu to be tuned to not recognize the O2 sensors (which become redundant with heavy acceleration and WOT anyway). In time, without re-tuning the ecu, it would really effect the running of the engine, you could say the ecu de-tunes the engine.

Like I said, not too sure what relevance this carries when talking about landys, but thought I'd put it out there.
You can however get hiflo cats in place of the factory ones, I think the biggest core available ATM is 100cpi, they aren't really euro4 compliant, but are a better alternative to no cats, they still burn off much of the excess exhaust emissions and give exceptional flow while maintaining some sort of legality.

Don't go twin pipes.
You'll lose your bottom end.

O2 sensors are pre-cat.

Originally Posted by Tombie2

Don't go twin pipes.
You'll lose your bottom end.

O2 sensors are pre-cat.

Thanks for the advice - would love to know if anyone has come up with the "perfect" custom exhaust..... if not twins then maybe 3" or something, whilst i would like to hear a little more of the V8 note i'm more about chasing a couple of extra horses by allowing it to breathe a little better.
I have heard that the cats cause way too much restriction and that you see more of a result doing away with them than you do by installing extractors/headers.
Just dont want to spend a lot of cash making the same possible mistakes someone else might have already.
What to do................what to do...........??????????????????