[Gaz1512]

Could anyone tell me if I require the cat for m.o.t's only got y pipe on mine? Been told the law on m.o.t's change this year on cat's not sure how true this is.

 

[dominic1]

no you have 2 more on the down pipes

 

[professor matt]

The Gtr has 4 cats 2 main ones in the downpipes and 2 secondary cats in the y-pipe

you'll pass a MOT with the secondary cats removed but not with the primary ones in the downpipes removed

 

[Nedzilla]

It will pass the emissions with just the cats in the dps but it is illegal and an mot failure to remove a cat that was put there by the manufacturer.
Just pray you dont get a jobsworth of an MOT tester who is also a GTR expert!

 

[gtr mart]

Is the failure due to emissions or due to the physical removal of the main cats?

 

[Nedzilla]

Just for removing the cats. It will still pass on emissions,most testers dont know that cats are supposed to be there though,you just tell them the only ones are in the down pipes.

 

[SamboGrove]

So is having a decat y-pipe technically illegal?

I've put off going full decat as thought it was this step that made it technically illegal. But if I'm already illegal fu*k it!!

 

[gtr mart]

I was chatting to a family member who is an mot tester aboutthis and he too suggested the fail was simply for removing them. This surprises me that its not detectable through the emissions as i didnt think the downpipe cats were particularly visible, meaning if you didnt mention the removal of them then they wouldnt be able to tell.

 

[[email protected]]

I was chatting to a family member who is an mot tester aboutthis and he too suggested the fail was simply for removing them. This surprises me that its not detectable through the emissions as i didnt think the downpipe cats were particularly visible, meaning if you didnt mention the removal of them then they wouldnt be able to tell.

You are spot on !
kk

 

[gtr mart]

Hmm KK I can feel a market emerging for performance downpipes and y pipes with fake/hollow cats on for those super law abiding gt-r owners out there (if such a thing exists.)

 

[professor matt]

in the real world the only reason the car would fail due to the removal of the cats would be emissions

 

[[email protected]]

in the real world the only reason the car would fail due to the removal of the cats would be emissions

Not now as they are stipulating a missing cat is reason for rejection and on its own merit a failable item (missing cat).

The market will follow and change. How does the normal tester know if its missing if it passes a bets test. This is the grey area.

We know how we could assess all these things ! however this may pass over the NT,especially if the car meets the emission standards and he doesn't know a GTR inside out.

Best not to ask to many questions and take the pass

kk

 

[Gaz1512]

Thanks for your knowledge :thumbsup:

 

[TomS]

A car with RF downpipes but OEM/catted y pipe will pass emissions won't it?

 

[RBT]

Just for removing the cats. It will still pass on emissions,most testers dont know that cats are supposed to be there though,you just tell them the only ones are in the down pipes.

ahahahaha that is a great trick.