SPDZ1 Subaru WRX 08-14 / STi 08-21 Twin Scroll High Flow Cast Bellmouth Race Downpipe
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
SPDZ1 Twin Scroll High Flow Catless Downpipe
For 2008-2014 WRX & 2008+ STi (Twin Scroll Turbo setups)
Unlock the Next Level of Subaru Performance
If you’re serious about your build, staying stock isn’t an option. The SPDZ1 Twin Scroll High Flow Downpipe is engineered from the ground up to dramatically improve exhaust flow, turbo response and peak power — while maintaining the ride-quality and reliability you demand.
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Purpose-built for Twin Scroll setups – Designed specifically for the 2008-14 WRX and 2008+ STi with twin scroll turbo layouts, it ensures perfect fitment and maximum performance.
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True cast bell-mouth inlet – The precision cast bell-mouth inlet smooths out airflow right out of the turbo, minimizing turbulence and unlocking faster spool and stronger mid-range punch.
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Premium 304 stainless & mandrel bends – Built with full mandrel-bent stainless piping, CNC-machined flanges, and heavy-duty TIG welding for long-term durability and clean aesthetics.
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Wideband ready – Comes with an extra O2 bung so you’re fully ready for tuning, logging and tracking — a must for any serious build.
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Bolt-on simplicity – No joke-mods required. Fits directly into the factory location (for the compatible models) for a streamlined install and confidence-boosting fitment.
Why This Downpipe Beats the Competition
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Many competitors offer “high flow” claims, but the SPDZ1 design backs it up with cast bell-mouth precision and twin scroll-specific engineering.
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Lower cost than many premium brands, yet uncompromising material quality and construction standards.
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Backed by the in-house support and heritage from 26+ years of Speedzone Performance LLC — you’re buying parts from a brand that actually walks the talk.
Performance Gains You’ll Feel
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Noticeably faster turbo spool and reduced lag — thanks to more efficient exhaust evacuation.
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Stronger mid-range torque, sharper throttle response, and more usable power where you drive every day.
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A deeper, more aggressive exhaust tone (especially when paired with other supporting mods) — without becoming obnoxious.
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Built to be tuning-friendly: this is a platform upgrade, not just a bolt-on “audio” piece.
Fitment Details
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Compatible with: 2008-2014 Subaru WRX (6MT, Twin Scroll) and 2008+ Subaru STi (6MT, Twin Scroll).
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Note: This is a catless downpipe and is intended for off-road / track use only. Please confirm your local emissions laws before installing.
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Recommended to pair this downpipe with a tune or professional calibration for best results.
What’s in the Box
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SPDZ1 Twin Scroll High Flow Catless Downpipe (precision engineered, as described above).
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Full hardware/gasket kit for installation (bolts, gaskets, sensor ports).
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Extra O2 bung (for wideband/logging).
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Instruction sheet and support from Speedzone’s install team if needed.
Brand Guarantee & Ownership Confidence
When you buy from Hour brand SPDZ1 (via Speedzone Performance), you’re not just getting a part — you're gaining the backing of a team with decades in the performance space. They stand behind fitment, finish and customer service.
Ready to Launch Your Build
Don’t settle for mediocrity. The SPDZ1 Twin Scroll High Flow Catless Downpipe is the one foundational piece your 2008-14 WRX or 2008+ STi needs to truly wake up. Fit it. Tune it. Drive it. Then enjoy the grin.
Fitment:
- 2008-2014 WRX (MT Only)
- 2008-2021 STI (MT Only)
- 2005-2009 Legacy GT (MT Only)
- 2005-2009 Outback XT (MT Only)
- 2009-2013 Forester XT (MT Only)
IN STOCK AND READY TO SHIP!!
Buy It With
Our History
For 23 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.