I know it's a test pipe, but whats that little pipe on the side for?

 

02 sensor I think

 

so what would you connect to it?

 

egt gauge?

 

thats really odd that the fitting is so long. any kind of o2 sensor would need to be alot further inside the piping. and it is most certainly not an egt gauge (they go on the exh manifold). plug it up

 

i would imagine for tuning purposes to put a wideband into

 

a wideband sensor needs to be directly in the flow of the exhaust, as i said before that fitting is too long to stick any type of o2 sensor in.

 

haha that little pipe is starting to bug me lol, but anyways what would you plug it up with?

 

what pitch is it?
im sure like a flywheel bolt or something would work. if it's standard, take it to homedepot and get a plug. you could cut it shorter and use it as a wideband if the threads go all the way through the tube

 

I have pretty much that same test pipe and that bung is plugged up with a bolt. Just Home Depot it.

 

Yea i think thatz what i will do. Thanx for the help.

 

It's a built in defouler. A lot of aftermarket test pipes and dp's have them now a days. It's there to deter or limit the amount of exhaust flow to the o2 sensor. Therfore, tricking the computer into thinking there is still a catalyst on the car. It' for the secondary or post cat. o2.

 

good observation ^ you can also get a resistor or wire in an o2 simulator (what i did)

 

Thats you put the Flux Capacitor

Edited:

Thats where you put the flux capacitor

 

you're only allowed to post useless crap if you dont forget words in your sentence