MPx Stage 3 O2 Housing (for use w/ Mopar Stage 3 Kit), 03-05 Neon SRT-4

Review star icon Review star icon Review star icon Review star icon Review star icon
Model Number: 220920

If you own a Neon SRT-4 with the Mopar Stage 3 Turbo Upgrade, you've got a great combination. More than likely you have also made other modifications like an intake, intercooler, and 3.0" exhaust.

Now, the one thing holding you back from a faster spool time and more power is the Mopar Stage 3 O2 housing. Mopar designed the Stage 3 Turbo Kit to be compatible with the factory downpipe and exhaust, and therefore the Mopar Stage 3 O2 Housing necks down to a 2.25" outlet.

Imagine this, the Mopar Stage 3 O2 Housing goes from 3.5" to 2.25". If you then add a 3.0" exhaust to the equation the inner diameter increases again, creating unwanted turbulence.


We've eliminated all of the restrictions by creating a stainless steel O2 housing made in the USA, that goes from the factory outlet size of 3.5 inch to 3 inch outlet. This allows for NO restriction after the turbo going into the exhaust.

In order to make this O2 housing, we had to take 3 inch piping and then expand it to 3.5 inch on one side. We also had to create from scratch a special 5 bolt flange since no one else in the automotive industry uses this special step lipped 5 bolt flange.

All of the support brackets and heat shield bosses are in place, allowing a smooth installation with no cutting, hacking, welding, etc needed.


  • All American made
  • Full stainless steel.
  • Custom made 5 bolt flange with stepped lip ensures no leaks like the oem o2 housing.
  • Swanged outlet makes sure that gases flow smoothly with NO interuption or turbulence.
  • Has support bracket and o2 sensor port

Click on some of the thumbnails above to see this finely crafted piece.

Ask a Product Question

  • Juan Hernandez
    Would this be compatible with other turbos( i.e agp zeta 3.0)?
    1 Answer
    • Modern Performance

      No. This is ONLY compatible with the Mopar stage 3 turbo kit.
  • Anonymous
    would this fit on a HAHN 20g?
    1 Answer
    • Modern Performance

      No, this ONLY fits the Mopar stage 3 turbo unit.
  • Pavel
    Can you or will you sell just the five hole plate that connects the o2 housing?
    1 Answer
    • Customer Service Rep

      We are not offering the flange separate.