So this is the HFC i ordered, The one i received looks exactly like this with the exception of the little opening stem thing on one side. I see it on other high flow cats as well but not all of them and its not on test pipes so whats it for or should i contact the company to get a new one?

 

That's a bung for your rear 02 sensor.

 

so basically they forgot to weld it on mine, leaving me no where to reconnect it?

 

The o2 should screw into the bung for it.

 

That could be it, is this HFC evo specific ? I know the evo 8 and 9 have different o2 bung locations on the cat but it should still be on there, unless they expect you to weld on your own bung. I would call the company and see whats up.

 

Yes its evo specific and actually evo 8 specific they asked before purchasing if its for an 8 or 9.



Edit: I looked at my catback exhaust and it has something that looks like that and its threaded with a bolt in it, gonna assume thats where the 02 goes.

 

Evo VIII's don't have an o2 sensor in the cat pipe, so you're fine. Evo IX's do.

 

my testpipe has an o2 bung on it

 

Stock Evo 8 O2 sensor bung location is on the midpipe after the catalytic converter.
Stock Evo 9 O2 sensor bung location is on the catalytic converter.

The part that you ordered is specific for an Evo 8 like yours.

 

Hi all!
I've just visited this forum. Happy to get acquainted with you. Thanks.

 

...???

Hey?