im asking cuz i might buy one ! ..
a friend is selling his doesn't know the brand of it ! ..
and im gonna take the size of it ..
so im wondering is the ebay 02 housing 3" or 2.5" ??

 

no not at all. 2.5 i think

 

it's not 3" but the design is significantly better than stock and saves weight also

 

also 100% true

 

thanx everyone so it's 2.5 ??

 

yes

 

2.5" outlet going to the DP. It never has been claimed to be 3" and doesn't need to be 3". The testing has been done on this.

 

Thanx .. guys ..
that's was a big and quick help ! ....

Peace ..

 

I believe stock is 2.25", the ebay is around 2.5". It is a great tested piece, you will not be disappointed.

 

yup 2.5...but thats all you need.

 

would 3" have any benefits?

 

No.

As I said, the testing has been done. Go read the thread by Buschur.

 

Uh, what??

 

it is 2.5", i just put one on over this weekend i noticed a difference on the butt dyno.

 

It's 2.5" Make sure to use plenty of anti-seize when installing the downpipe to it. I had one that i installed on a friends car and the mounting flange rusted all up. Not all stainless as described, and the O2 sensor bung was cross threaded. If you get a good one, it's worth the price.