STM Evo 7/8/9 O2 Downpipe Recirculated for OEM-Style Housing

STM Evo 7/8/9 Downpipe Gaskets & Hardware

STM Evo 7/8/9 O2 Downpipe Installed (V1)

$949.00

STM-EVO-O2DP-RC

The STM Evo 7/8/9 O2 Housing Downpipe combo is the perfect bolt-on addition to your exhaust! Features a recirculated design to route the wastegate back through the 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.

Vehicle Fitment:
2001-2006 Mitsubishi Lancer Evolution VII VIII IX
• Fits with OEM or factory-style turbo hotside

Features:
• Recirculated
• Hand Fabricated
• Tig-Welded
• Back-Purged
• 3" Stainless Steel
• CNC Flanges
• Gaskets and Hardware Included
• Made in the USA!
• Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects

Weights:
• STM Downpipe weighs 9.7 pounds
• Gaskets & Hardware weigh 5.7 ounces

Purchase Includes:
(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

Shipping Times: 1-14 Days
Hand crafted and welded in New York, please give our fabricators time to assemble your piece!

Redesigned In February 2026:
The new design features the STM engraved stainless flange and smoother transitions for better flow. The updated downpipe is pictured in detail. V1 is pictured installed. Same fit, more flow!

See more STM Products

STM downpipe/ O2 recirc

hello i just installed this downpipe and now the lower bars doesnt fit, it hits the downpipe. It appears that the downpipe is about 1-2 inch lower than stock which makes it interfere with the lower cross bars. Anyone else have this issue?

Beautiful piece

STM Downpipe / O2 Recirculated for OEM-Style Housing - Evo 7/8/9

Very great product, nicely weld, fit well under the hood.Good angle for O2 sensor. The car idle quieter now, engine run smoothly compare to my old leaking downpipe. But when it got boost OH MY... I wasn't prepared for that tone / sound, fantastic. Keep going STMTUNED

STM O2/Downpipe Recirculated for OEM-Style Housing

This is a no question buy. Why have a o2/downpipe when STM make this amazing combo less bolts and gasket's!! Cant wait till i pair it with a FP cast Mani and a Blouch Evo IV-IX Dominator 1.0XT Turbo (Journal Bearing) going for a 500whp sunday monster.

Anyway this a top quality system with Amazing and Perfect welds!
Proud to support a American company!

Thanks for the great feedback, Dylan! Make sure to send us over some pics when its all installed : )


	WARNING: Cancer and Reproductive Harm www.p65warnings.ca.gov

STM Evo 7/8/9 O2 Downpipe Recirculated for OEM-Style Housing

STM Tuned Inc.

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