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Discussion Starter · #1 ·
I just recently put an Armytrix Exhaust system on with a de catted downpipe. I am getting a check engine light because of the downpipe. Is it necessary to put a tune on the car? If I don't put a tune on it will the car experience problems?

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Normally you need something that can delete the CEL when you remove the CAT.

I did read that it's possible to have some sort of spacer on the sensor which fools the system not to give the CEL but I don't know much more than that.

Some piggy back tuning boxes like the JB4 can delete the CEL
 

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MOT will fail as without CAT it will not meet emissions...

The way round it is you know some dodgy MOT'ers who will turn a blind eye or to remove and re-install the De-CAT for the MOT

There is an option for a Sports CAT which should still pass MOT and much less restrictive than an OEM CAT but less effective than a De-CAT
 
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