Advice on full decat

[GeckoGareth]

Just remember blank off the pipe that goes to the centre section cat.

Thanks but do you know why this needs blanking off? What would happen if it wasn\'t blocked off?

cheers

G

[dr3]

Yep thats right, its amazing how much it does aswell.
But just remember if you are running without the air box, when you sit in traffic the hot air under the bonnet will damage the bearings in the pump, as I found out with mine, twice! So if thats the case only plug it in for the MOT or it will make a rough noise.

[GeckoGareth]

I\'m a bit confused now. Am I better off unplugging the air pump so it doesn\'t run or just blocking the pipe that used to run into the cat? :S

Cheers

G

[dr3]

Sorry mate, I\'m watching the footy at the same time, may not have been thet clear.
Block off the pipe that used to go to the centre cat, then for:
 
Normal running, just unplug the wires to it.
For the MOT, plug it in.

[dr3]

G.

I reckon it would just waste extra air that helps dilute the exhaust gas even further.

[Ricco_04]

The other thing, if you have aftermarket filters the airpump makes that mooing sound so with full decat you can also remove the moo\'s!  :chat

(another benefit then!  :guinness )

[GeckoGareth]

Ok. Hoping I\'m not looking a complete muppet but still can\'t see exactly why it needs blocking off where it went into the old cat!?! Surely it\'s just pumping air into the atmosphere? Is this a bad thing?

Hmmm. My head hurts.

G

[strange_days_uk]

Hi All,

When I had my last MOT I found out that I still qualify for the non-cat test    I am about to fit my decat downpipe and get her re-mapped but as I have the more lax requirements (3.5% & 1200) can I get away with full decat?

I have gone through some posts and found some people do pass and others don\'t? - I have read some people have had 7% Co!  :eek

If it depends on mods then all I will have is twin Apexi filters, 3" downpipe, scilenced mid pipe, Apexi GT Cat back & Apexi PFC

Thanking you in advance

94 Twin tub apexi twin intake apexi pfc mapped to 290 rwhp bov full decat pass first time

DO IT !!

[dr3]

I\'m just presuming that it would force less air into the exhaust if it could let it out into the atmosphere, surely the more fresh air in the exhaust come MOT day the better???

[Ricco_04]

94 Twin tub apexi twin intake apexi pfc mapped to 290 rwhp bov full decat pass first time

DO IT !!

Ace! I cant wait now. It\'s now just a matter of when not if!    :driving  :3gears-lh  :yes    :Thumbs-up  :bandit    :Thumbsup!  :Party