Hey I have this pipe that goes down the back of my motor, and it looks like it attached to the exhuast at one time in its life,, what is it?? what does it do, should i fix it ..lol

 

sounds like the pipe that comes off the EGR valve. it hooks into the exhaust. any CEL on?

the Egr valve


Exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in most gasoline and diesel engines.
EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Intermixing the incoming air with recirculated exhaust gas dilutes the mix with inert gas, lowering the adiabatic flame temperature and (in diesel engines) reducing the amount of excess oxygen. The exhaust gas also increases the specific heat capacity of the mix, lowering the peak combustion temperature. Because NOx formation progresses much faster at high temperatures, EGR serves to limit the generation of NOx. NOx is primarily formed when a mix of nitrogen and oxygen is subjected to high temperatures.


probably should fix it...

 

It also may be the smog pump air injection tube. If it's in the catalytic converter then it's for the smog pump. You should repair it if you have emission inspections in your state or it won't pass. Otherwise, who cares? It just adds fresh air to help the cat burn off the unburnt fuel.