STM Evo 7/8/9 O2 Downpipe Atmosphere Dump for OEM-Style Housing *Discontinued*



More info below

The STM O2 Housing Downpipe combo is the perfect bolt-on addition to your exhaust! The all-in-one stainless steel design will eliminate extra hardware and flow smoothly straight through from the turbo utilizing the tapered CNC flange. All gaskets and necessary hardware are included for a clean install.

As of June 2023, we no longer offer the atmosphere dump option. Please see the STM Recirculated Downpipe for OEM-Style Housing

Vehicle Fitment:
2001-2006 Mitsubishi Lancer Evolution VII VIII IX
• Fits with OEM or factory-style turbo hotside
• Fits with OEM and STM lower intercooler pipe
• Does not fit with ETS lower intercooler pipe

• Hand Fabricated
• Tig-Welded
• Back-Purged
• 3" Stainless Steel
• CNC Flanges
• Gaskets and Hardware Included
• Weighs 10.40 pounds

Made in the USA!
Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects.

(1) STM Stainless Downpipe
(1) STM Divided Turbo Outlet Gasket (STM-EVO-SSG-DTO)
(1) 3" 2-Bolt Remflex Gasket
(2) M10 x 35 Bolts
(2) M10 Nuts
(2) M10 Flat Washers
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Customer Reviews

Based on 4 reviews
Vinnie Huynh (Victorville, CA, US)
STM O2 Downpipe

Fitment is on point with my ETS LP2 LICP. Sounds awesome when you get into boost, my whole car is getting all types of STM parts on it. Great products, cool people. Thanks! 👍🏻

Grade A Garage *Dealer Account* (Pittsburgh, PA, US)
A+++ quality and service

Fitment was great on the down pipe and shipped fast!

M Conza (Mount Waverley, VIC, AU)

Does the screamer pipe clear the factory inter cooler pipe? and will this along with the STM test pipe bolt up to a Tomei expreme cat back?

Daniel Aarup (Meiningen, TH, DE)

This downpipe looks amazing! Beautiful welds and clean stainless. Only downside, didn’t come with replacement gaskets for the price paid.

Hi Daniel,

Thank you so much for the kind words. This downpipe should indeed come with a gasket, I have sent you an email in regards to hopefully getting a gasket sent out to you asap and apologize for the inconvenience.

Cancer and Reproductive Harm