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Invidia 08+ Subaru WRX/STi 3in Downpipe to 2.5in Exhaust Adapter

Invidia
INVHS02SWIAPD
In stock
Steel Tubing
$98.00 $52.68
Subaru downpipe adapter needed? The Invidia 3″ to 2.5″ Exhaust Adapter (invHS02SWIAPD) is your go-to solution...
$52.68

customers are viewing this product
Invidia 08+ Subaru WRX/STi 3in Downpipe to 2.5in Exhaust Adapter

Subaru downpipe adapter needed? The Invidia 3″ to 2.5″ Exhaust Adapter (invHS02SWIAPD) is your go-to solution for clean, leak-free connection between a 3‑inch downpipe and a 2.5‑inch cat‑back system on 08+ WRX/STi. No hacks, no guesstimates, just a proper mating in stainless steel.

Every time you mix a larger downpipe (3″) with a smaller exhaust (2.5″), you risk leaks, turbulence, or fitment headaches. The Invidia downpipe adapter bridges that gap precisely — giving you optimal flow, structural integrity, and peace of mind under boost or daily driving.

This adapter is engineered for enthusiasts who demand performance and reliability. It ensures your exhaust transitions cleanly, minimizes turbulence, and prevents exhaust leaks that can kill power or cause noise. Whether swapping parts or upgrading in stages, you deserve seamless compatibility.

Features & Benefits

  • Stainless steel construction – resists corrosion, holds up to heat and wear

  • 3″ to 2.5″ transition design – engineered to match Invidia downpipe to stock or 2.5″ cat‑back systems

  • Precision flange interface – eliminates mismatch and leaks between components 

  • Hardware included – all necessary bolts / gaskets / mounting parts for installation

  • Optimizes exhaust flow – smooth transition reduces turbulence and preserves performance 


When & Why You Need It

If you’re pairing a 3″ aftermarket downpipe with a 2.5″ cat-back (or OEM exhaust), this Subaru downpipe adapter is essential. Without it, you’ll struggle with exhaust leaks or forced modifications. Use this as the “bridge” so your performance parts actually work together harmoniously.


Specifications

Specification Detail
Part Number invHS02SWIAPD
Application / Fitment 2008+ Subaru WRX / STi
Adapter Size 3″ (downpipe side) → 2.5″ (exhaust side)
Material Stainless steel
Installation Style Bolt-on, flange interface
Included Hardware Gaskets, bolts, mounting hardware

REVIEWS

BJK

Installed this adapter on my 2009 WRX in Seattle, WA when upgrading my downpipe. No leaks, perfect fit, and it made connecting to my 2.5″ cat-back effortless.

Brian J. K.

Seattle, WA

★★★★★
LMT

I needed a reliable adapter when putting a 3″ downpipe on my 2012 STi in Austin, TX. This Invidia unit did the job cleanly — no extra welding, no guesswork.

Laura M. T.

Austin, TX

★★★★★
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Effective Date: October 2024
We offer a 30-day return policy, allowing you to request a return within 30 days of receiving your item. To qualify for a return, the item must be in its original condition—unused, with tags, and in its original packaging. A receipt or proof of purchase is also required.

To initiate a return, please contact us at info@riotparts.com. Returns must be shipped to the address provided upon request. If your return is approved, we will issue a return shipping label along with detailed instructions.

Important
Returns sent without prior authorization will not be accepted.

For any return-related inquiries, please reach out to us at info@riotparts.com.

Return Shipping Address
The return shipping address will be determined based on the requestor’s location to ensure the nearest return facility is used.

Possible return locations include:
10880 Lear Blvd.
Reno, NV 89506, United States
931 W. Bardin Rd., Suite 150–200
Arlington, TX 76017, United States
3035 Campus Dr.
Hatfield, PA 19440, United States
5789 N. Graham Road, Ste 200
Whiteland, IN 46184, United States
2020 NE Aloclek Dr 4711 N Lamon Ave
#118 STE 12, Hillsboro, OR 97124, United States

Damages and Issues
We recommend inspecting your order upon receipt. If you find that an item is defective, damaged, or if you received the wrong item, please contact us immediately so we can address the issue.

Exceptions / Non-Returnable Items
Certain items cannot be returned, including:
• Electrical parts that have been installed or used
• Special order parts that were custom ordered for you
• Items that have been damaged due to improper installation or use

If you have questions or concerns about a specific item, please contact us for assistance.

Exchanges
For exchanges, the quickest option is to return the item you have. Once the return is accepted, you can make a separate purchase for the new item.

Refunds
We will notify you once we receive and inspect your return to inform you whether your refund is approved. If approved, you will be automatically refunded using your original payment method within 10 business days. Please be aware that it may take additional time for your bank or credit card company to process and post the refund.

If more than 15 business days have passed since your return was approved and you haven’t received your refund, please contact us at info@riotparts.com.

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