All Things Mk5 > Performance Modifications

De-cat / Sports Cat with no remap?

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emma:
Hi Guys

Last week i brought my mk5 golf gti, the engine light has come on which is caused by the cat. Have turned the light off and so far hasnt come back on. Still running absolutely fine.

I was thinking rather than replacing with a standard cat was looking at a de-cat or sports cat with exhaust system.

Are there any systems out there that arent 3"? or have people put a 3" system on without a stage 2 remap?

Also opinions on de-cat or sports cat?


Thanks :)

Paradox1:
IF you fit a 3inch downpipe, you don't (need) a map...

but it will run rich and you with get a decrease in MPG as well as a check engine light.

but of course a decent remap can fix all of the above!

Dan_FR:
Any decat or sports cat will bring on the EML until mapped accordingly but the car will drive fine until then. If you do not want 'Stage 2' mapping then look for a used/second hand cat from here as there will be loads of people who have removed them and no longer need them

akbarirfan:
I can confirm that the car will run rich, as I am getting poorer by the mile  :scared:

dronners:
i've got a 3"  pipewerx  downpipe and sports cat..  no EML and no adverse effects.  still 34mpg on a motorway run as before

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