Exhaust help

[eddie555]

Hi guys, I was thinking of removing the second cat from my wrx bugeye, I've already put a stainless cat back on. Would I need a remap or will it be ok to run with just the one cat?

Cheers

[GeoffLeggy]

Is it already remapped? 

[eddie555]

No, not been mapped.

[GeoffLeggy]

Wouldnt worry at all, youll probably just notice a change in tone thats it. Will flow better but engine characteristics shouldnt be affected.

Anyone suggest otherwise?

[stants]

Should be fine depending on location of 02 sensors, just make sure you get a decat pipe with the boss in for the sensor

[GeoffLeggy]

This should be your layout.

 

[eddie555]

Will there be any issues with mot? Or should it be ok with the one cat?

[GeoffLeggy]

The first cat will be doing all the main work as hot off the T but honestly I don't no.  Hopefully someone here has that set up and can advise.  Of course if your replacing the whole section just bolt the old one in for the MOT retest if it fails  :D

[martyc]

I've got a 2nd decat to fit too, the o2 sensor is before the 2nd cat so shouldn't throw a CEL, and the downpipe cat should be efficient enough to pass an mot, more so than a 'sports' cat that are advertised as mot friendly

Sent from my iphone using Tapatalk

[stants]

Sports cats are about as mot friendly as going in there and slapping the tester across the face, saying that mine wasn't mapped last year and was chucking fuel through the system like it was going out of fashion.

You may need to back out the 2nd sensor with an adaptor a but if you do get any error codes you'll be able to possibly remove them with the ssm2 software available on the webs