My mate told me if i buy a new exaust system for my car it comes with 02 sensores already is that true?

does that mean i would need to replace my turbos aswell?

no it wont come with o2 sensors, and no you dont need to replace the turbos lol.

My mate told me if i buy a new exaust system for my car it comes with 02 sensores already is that true?

does that mean i would need to replace my turbos aswell?

 

As Jimmy said, any new exhaust will NOT come with O2 sensors and turbos are unrelated to the exhaust system so you do NOT need to change them either.

 

I can see where this is coming from though ...

 

The O2 sensors (also known as Lambda sensors) are located in the manifold, the bit that sits just before the catalytic converters. In turn the catalytic converters have EGT (exhaust gas temperature) sensors in them. So, if you buy a pair of de-cat pipes then the EGT sensors will be lost. This is perfectly ok and you just need to make sure the wires are insulated sufficiently so as not to short out on any metalic chassis parts. If you purchase a cat-back exhaust and retain the catalytic converters then you don't need any new sensors.

 

With regard to changing turbos, the removal of catalytic converters will reduce the back pressure on the turbos significantly. This will allow them to spool up faster but at the same time may allow oil to trickle past the rear turbo seals (which are probably worn out after being on the car for 15+ years). This manifests itself as heavy smoking when the car is idling. To rectify this you need to remove the turbos and replace the turbo seals (or get new turbos).

 

Hope the above was useful information.

 

Regards,

 

Dan

great info thanks very much :)