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LHU Regal o2 Housing/Downpipe Package

Exhaust - LHU Regal O2 Housing/Downpipe Package
Exhaust - LHU Regal O2 Housing/Downpipe Package
Exhaust - LHU Regal O2 Housing/Downpipe Package

This will replace your factory o2 housing and downpipe with our high flow ZZPerformance package. It is made of stainless steel so it will outlast the car. The ZZP unit is two pieces just like the factory parts and they are joined by a 3" VBand clamp assembly. This package will bolt up to the stock turbo and cat back exhaust with no modifications needed.

The gains are hard to measure because the Regal adjusts its boost by the amount of airflow the MAF sensor is seeing. So as you add mods the car sees the added airflow and reduces your boost to bring the power back down. So we included a dyno sheet to show the gains. Our o2 Housing/Downpipe package, ZZP tune, and ZZP high flow intake tube bring the average HP and torque gains of 70 whp and 70 ft lbs of torque across the entire pull which is huge power gains! The peak gains of this package were 89 whp and 77 ft lbs over stock!

Please make sure to select the correct model because the GS has different hanger locations and a larger outlet flange.

Please note: the factory o2 housing uses a ring style gasket. that is left out when installing this product. you can use a small amount of red high heat RTV at the turbo to o2 housing connection.

Fits 2011-2013 Regal 2.0T

Our downpipes come with a high flow catalytic converter that is 48 state legal. Our catalytic converters will not pass California or New York state emissions. Please contact if you have any questions.

We are currently offering $100 in store credit to purchase your stock catalytic converter back from you. If you're interested, take a photo of your stock downpipe and email it to We will provide prepaid shipping labels for domestic (U.S.) shipments.

Exhaust - LHU Regal O2 Housing/Downpipe Package
Exhaust - LHU Regal O2 Housing/Downpipe Package
Exhaust - LHU Regal O2 Housing/Downpipe Package
Customer Reviews
4.8 Based on 30 Reviews
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Shawn W.
United States United States

Good craftsmanship

Fit was great. Pro tip would be connect v band before installing mid pipe hanger. That will help with bending the flex around. Sets p0420 code as expected but nothing hp tuners can't help with.

Roberto P.
United States United States

Great product

Works good great sound make sure to get a good gasket for turbo part of installation instead of red rtv gasket sealant

Andrew H.
United States United States

Zzp downpipe

I really enjoy the new downpipe on my regal. It opened it up and I can definitely feel and heart improvement from the factory one. The only issue it’s given me is that the bank 1 o2 sensor lights up the check engine light every time I drive it with a p420 code. Both downstream sensors were replaced so it’s very confusing to me. Other than that I absolutely love it!

ZZPerformance LHU Regal o2 Housing/Downpipe Package Review
United States United States

ZZPERFORMANCE downpipe kit.

Completely satisfied. Perfect fit and function.

United States United States


Quality, fit and finish were top notch. Would have been helpful to know that O2 sensor might trigger CEL