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If that was the case surely aftermarket exhaust systems without the back CAT wouldn’t be a thing? Sent from my iPhone using Tapatalk

I think it could be because the previous owner removed the back CAT and didn't installed the lambda sensors. Over the weekend I got an engine light on the car and it was a catalyst fault. After further digging I found that the sensor we not installed at all. Making the car run rich thinking...

Hi, The guy I brought my S4 off removed the back CAT's and didn't install the rear lambda sensors. I have been told I can just drill a hole in the current exhaust and install them? Is this correct? I am a bit dubious as the sensor will record different information without the CAT being...

I was looking at getting it carbon cleaned but I don't know if thats possible with a V8. Has anyone had it done and noticed any improvements. The car doesn't feel underpowered at all.

Hi, I have a B7 S4 55 plate 134k miles. I get black smoke coming out of the exhaust when I accelerate. This doesn't happen all the time. It seems to happen if Ive just come off the motorway come to a stop and then pull away. I can see the tail pipes drivers side look fairly black covered in...