During the removal I noticed a sensor about midway under the car. Does this need to be reinstalled?

 

I'm not sure but odds are its there for a reason. Still trying to learn about my own car and this site. Hopefully a more experienced poster will chime in too. Good luck.

 

That would be the o2 sensor. Yes, reinstall it when you're done.

 

Not positive on your car, but there's likely a ground wire somewhere down-stream from the O2 sensor...usually from an exhaust flange connection to the chassis/body. You should make sure that's clean and making a good connection as well.

 

It has to be reinstalled or relocated... your choice really but it is mandatory

 

Didn't know there's a sensor on the exhaust, sure you are not talking about the downpipe?

 

midway down the length of the car? i'm thinking it's likely the exhaust overheat sensor ....


EDIT: hold on. i'm assuming you meant removal of the stock system. is that right?

 

pretty sure its the exhaust overheat sensor and i read you dont need it.. but not 100per on that, but 99%

edit.. its that sensor if its bolted in by two screws

 

That makes sense. It is held on by 2 bolts. I may just put it back for yucks.

I am in the process of getting rid of all of it. a note to all.........Walker doesn't make the last section of pipe that Racing Beat says to get from Mazda................good luck with that.

 

Im thinking of getting the racingbeat headers soon

 

Header is in. You will have to cut a small section of the heat shield. I also am having a hanger issue. Plan to sort it out tomorrow.