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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 29 Reviews
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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

Tyler B.
United States United States
Awesome setup for the price

Great kit for the money. Wish a catless option was still available, but EPA likes to ruin our fun. The stock pipes were a royal pain in the a$$ to remove as some of the bolts are in terrible locations, but once the old stuff is out, all the new parts bolt directly in and take nearly no time at all. Definitely recommend checking the VBand before you tighten everything down as it’s finicky. A self aligning v-band would be a nice addition. Came with all the bolts and gaskets to replace the (very rusted) midpipe hardware which was a nice treat. Welds all look great, stacked dimes TIG welds all through out the setup. An option to add a second **** at the top of the O2 housing for a wideband would also be a nice addition on the order form. All in all, simple install and fantastic fit.