This o2 housing bolts directly to the turbo's outlet and then bolts to the factory downpipe.  It is 3" in diameter, an o2 bung for your factory o2 sensor, and 100% stainless steel.  The outlet flange is tapped just like the factory o2 housing for ease of install, you will not have to deal with trying to hold the bolt when tightening the nut in the tight engine bay. 

Includes: 3 M8x30mm bolts along with an O2 gasket.

NOTE: Make sure to select the proper model for your vehicle. The '13-15 Malibu & '13-17 Regal have a 3 bolt and the '16+ Malibu has a 2 bolt exit flange. Does not fit '18 and up Regals as they switched to a 2 bolt exit flange. 

 Fits 2.0 engine ONLY (will not fit 1.5L engine). 

This does not fit rear wheel drive LTG ATS, CTS, or Camaro, but this one does RWD LTG Downpipe.