YD25 Catalyst removal info please?

oldskoolmark · Apr 13, 2011

Hi guys,

Recently i have read a few posts which mentioned removing the cat from the YD25 engine.

Has anyone done this? If so what gains have they seen?

I can only see that it will do the engine good, with regards to performance and MPG.

Any info on this subject would be great

Cheers, Mark :thumbleft:

Stanton · Apr 13, 2011

Easy enough to do, remove the cat pipe by unbolting from turbo and downpipe, then unbolt front prop at front diff and pull out of the way. Unbolt mid-section exhaust hanger, pull exhaust out of the way.
The you'll have enough remove to bring the cat pip down by the side of the engine.

Easiest thing then is to remove the catalyst element, and refit pipe only.

Gains- minimal / not noticeable.....did seem a bit free-er mid range....also hear a nice turbo whistle on idle!

oldskoolmark · Apr 14, 2011

Nice one cheers mate. I may give this a go one day when i get a spare 5 mins

Cheers :thumbleft:

dave · Apr 16, 2011

Why remove it ?

You will only gain like 2hp.

Stanton · Apr 16, 2011

"better out than in"

R_ace-navara · Apr 17, 2011

something like this

oldskoolmark · Apr 18, 2011

dave said:
Why remove it ?

You will only gain like 2hp.

Why not?

dave · Apr 18, 2011

Fines out here for removing it are $10,000.

Sniffer · Apr 19, 2011

Yep I would second that, I heard about the new MOT test to ensure the Cat is working, its posted on here under New MOT rules I think, try a search!!
Probably best to leave it alone
Regards
Sniffer

R_ace-navara · Apr 19, 2011

dave said:
Fines out here for removing it are $10,000.

Fines in my country are......come to think of it, there aren't any MOT test done in my country :lol:

oldskoolmark · Apr 19, 2011

Oh no what have i started :roll:

Stanton · Apr 20, 2011

We don't get fined in the UK, there's no legal requirement to have a catalytic convter, but you do have to pass an emissions test.

R_ace-navara · Apr 28, 2011

So lucky I live in my country

artycheer:
:dance:
No tests at all.

guzzio · Apr 14, 2016

Excuse me to bring up thos old thread, but hwo are you doing with the catalyst removal? Did you do it yourelf?

As far as unbolting the damn thing on the turbo and on the mid section ... owkay. But i got stuck around the bracket half way the cat. :frown2:
So as i got no spare time, i fixed the thing as original and planning to do the catalic removal later ... :wink2:

navman rich · Apr 22, 2016

you can remove the cat without removing anything except the exhaust (to pull back a bit) and the heat shield.
and then smash it out and re fit.
if i remember rightly. its 4 bolts from the turbo side and 1 from underneath.
fidely job with the heat shield, be careful not to round off the 10mm bolts.
and i found it easier to remove wheel and rubber flap.
i did have a thread somewhere. ill have a look and post if i find it.

YD25 Catalyst removal info please?

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