MAPerformance Downpipe Upgrade | 2008-2021 Subaru STI (STI-4G-DPC-REV2)

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$599.99 $660.99Instant Savings of 9% ($61.00)

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2008-2021 Subaru WRX STI / 2008-2014 Subaru WRX Downpipe Upgrade by MAPerformance

When the turbo compresses exhaust gas, its forced through a narrow OEM downpipe on its way through your exhaust system. This narrow pipe creates back pressure & reduces exhaust flow leaving your car short of its true power potential. MAPerformance has crafted the perfect solution to unleash this power and is proudly offering it to the eager 15+ Subaru STI market.

Designed to last a lifetime, the MAPerformance Subaru Downpipes are available with a high flow catalytic converter.

Built in-house from 3" mandrel bent 304SS piping our semi-divided head pipe maximizes exhaust flow and helps to eliminate unwanted boost creep. Utilizing a thick 1/2" stainless steel turbo outlet flange, high-quality interlocking lined stainless steel flex section and sporting an additional O2 bung, this STI downpipe has been designed to outperform & outlast our competitor's offerings at a price point that won't break the bank.

Mating our MAPerformance Subaru WRX / STI Downpipe to an OEM factory exhaust or aftermarket exhaust is a breeze. Simply select the option you'd like in the drop downs above and we will include all the necessary hardware.

Disclaimer: As sound level and emissions laws vary based on location, please consult your local authorities for additional information.


  • Semi-divided Cast head pipe to maximize flow and eliminate boost creep!
  • Divorced wastegate dump to increase turbine flow!
  • 1/2 thick stainless turbo outlet flange
  • Extra o2 bung and plug
  • Made from 304 stainless steel for superior corrosion resistance and enhanced appearance
  • Mandrel-bent tubing throughout optimizes exhaust flow
  • Stainless steel flex section reduces stress from engine movement increasing longevity
  • Designed to be used with your OEM turbo outlet gasket
  • 100% Made in the USA


  • 2008-2014 Subaru WRX*
  • 2008-2021 Subaru WRX STI*
  • *Will NOT Fit RHD Models

What's in the box?

  • One Piece Downpipe
  • Required Hardware & Gaskets

Installation Instructions


  • MAP Limited Lifetime Warranty

Customer Reviews

Based on 54 reviews
Nic Desilets

I have a 2019 STI with this downpipe (GESI cat) and so far after 4-5 months I still don't have a CEL. Build quality is great, install was simple with good fitment, no complaints.

Timothy Sattler
Great DP - No CELs so far

Primarily moved from to this from another DP (non-GESI, 200 cell cat) to eliminate the check engine light post-green speed update. So far so good at ~1,000 miles. Overall quality is great - flanges, welds, bungs, machining are all very nice. My hanger was a bit off, but I may have previously bent it for another DP fitment, nothing a little bending back can't fix. Included grimmspeed turbo gasket is a plus. I'll be getting my stage 2 tune checked soon, but no notable difference/negatives from the prior catted DP.

Great product

Very nice, welds look awesome product came with all the gaskets, great sound, and no check engine lights.

Jonathon Lawson
Solid choice

Upgraded to this downpipe because my old Cobb one kept giving check engine lights. So far this one seems to be good. The welds are awesome, product looked great.

Zachary Sciortino
Great bit of kit

I really like this kit. The install was straight forward and included a grimmspeed turbo gasket! The cat appears to be high quality and all the welds look awesome. Hangers are in the correct orientation and length. Shipping was fast as well.