• 15+ Years of Performance Parts, Tuning & Installation

STM Stainless Downpipe for 1G AWD DSM

  • Backed by real installs and tuning experience at FAST of West Chester

Everyday Low Price:

$449.00
$449.00
Shipping calculated at checkout.

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The STM full 3" stainless steel downpipe for 1G AWD DSM is made in-house at STM from 3" mandrel-bent tube and tig-welded flanges. Bolts to many stock-location aftermarket 2.5/3" o2 housings(make sure your 02 housing has a slotted flange) and any stock-location aftermarket 3" cat/testpipe. Fits AWD models only.

The STM downpipe utilizes all factory hangers and weighs in at 8.10 pounds with hardware. Pictured installed on the STM 1992 Talon shop car.

Vehicle Fitment:
1G DSM AWD
1990-1994 Eclipse GSX (AWD)
1990-1994 Talon TSi (AWD)
1990-1994 Laser RS (AWD)
• Fits ALL WHEEL DRIVE models only
• Does not fit front wheel drive models
• Does not fit the factory cat or factory o2 housing

Additional Fitment Notes:
The downpipe will not fit the stock o2 housing, but will bolt up to the STM O2 Housings as well as many aftermarket stock-location 2.5/3" o2 housings as long as they have Slotted outlet flange for the bolts to downpipe. If your aftermarket 02 housing only has circle holes for the bolts to downpipe, there could be fitment issues with it not lining up to our flange holes. The o2 housing is not included.
Does not fit the factory cat, but does fit with the STM 1G DSM High Flow Cat or any aftermarket stock-location 3" cat/testpipe.

Features & Specs:
• Full 3" stainless steel
• Stainless flex section
• Lightweight .049" wall
• Mandrel bent
• Tig-welded, back-purged
• Gaskets & hardware included
• Uses all factory hangers
• Weighs 8.10 pounds with hardware

Purchase Includes:
(1) STM 1G AWD Downpipe
(1) 3" 2-Bolt Remflex Gasket
(1) 2.5" 2-Bolt Remflex Gasket
(4) M10 x 35 Bolts
(4) M10 Nuts
(4) M10 Flat Washers
(1) O2 Bung Plug

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

Also available in a full turbo-back exhaust and all parts of the STM 1G DSM AWD Exhaust System are available to purchase separately as well:
• STM 1G DSM Turbo-Back Exhaust
• STM 1G DSM Cat-Back Exhaust
• STM 1G DSM High Flow Cat
• STM 1G DSM O2 Housings Recirculated or with TiAL MVS

Part Numbers:
STM-1GDSM-DP, STM-1G-DP-3

See more STM Parts
See more STM Products
  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved
STM Stainless Downpipe for 1G AWD DSM

$449.00

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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