STM Evo X O2 Housing Downpipe with Atmosphere Dump



More info below

STM Evo X O2 Housing Downpipe with Atmosphere Dump 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.

*Permanently Discontinued*
As of September 2023, this product is no longer available, but we do offer the STM Evo X Recirculated O2 Housing Downpipe

Part Numbers:

Vehicle Fitment:
2008-2015 Mitsubishi Lancer Evolution X

Power Gains:
With a simple downpipe swap, our Mustang Dyno results yielded +19 HP and +14 TQ!

Features & Specs:
• Dump to Atmosphere
• Hand Fabricated
• Tig-Welded
• Back-Purged
• Full Stainless Steel
• 3" 2-Bolt Exhaust Flange
• CNC Flanges
• O2 Bung
• Gaskets and Hardware Included
• Bolts to Factory Cat or Stock-Placement Race Pipe

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

(1) STM Downpipe
(1) STM Stainless O2 Housing to Downpipe Gasket
(1) 3" 2-Bolt Remflex Gasket
(2) M10 x 35 Bolts
(3) M10 Flat Washers
(3) M10 Nuts
(1) M10 x 40
(1) M10 Lock Washers

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Customer Reviews

Based on 3 reviews
Rivaciano Jazwiec (Albuquerque, NM, US)
Great quality

Delivery of my open dump pipe was much faster than I expected. A+ on quality, but kinda sad that the stm logo wasn’t on it :(

Jonathan anchondo (Santa Fe, NM, US)
STM open dump downpipe

Excellent quality, very pleased with my purchase!

Braydon Williams (Souderton, PA, US)
Open dump downpipe !!

Everything I ever wanted out of my exhaust ! Fast shipping. A super aggressive tone, welds and finish are amazing and for the price it’s honestly a quality piece. 10/10 recommend

Cancer and Reproductive Harm