SPDZ1 Subaru WRX 08-14 / STi 08-21 High Flow Cast Bellmouth Race Downpipe

SPDZ1 High Flow Catless Downpipe

For 2008-2014 WRX & 2008+ STi 

Unlock the Next Level of Subaru Performance

If you’re serious about your build, staying stock isn’t an option. The SPDZ1 Divorced Wastegate 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.

• 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.

• 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.

• Wideband ready – Comes with an extra O2 bung so you’re fully ready for tuning, logging and tracking — a must for any serious build.

• 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

• Many competitors offer “high flow” claims, but the SPDZ1 design backs it up with cast bell-mouth precision specific engineering.

• Lower cost than many premium brands, yet uncompromising material quality and construction standards.

• 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

• Noticeably faster turbo spool and reduced lag — thanks to more efficient exhaust evacuation.

• Stronger mid-range torque, sharper throttle response, and more usable power where you drive every day.

• A deeper, more aggressive exhaust tone (especially when paired with other supporting mods) — without becoming obnoxious.

• Built to be tuning-friendly: this is a platform upgrade, not just a bolt-on “audio” piece.

Fitment Details

• Compatible with: 2008-2014 Subaru WRX (6MT) and 2008+ Subaru STi (6MT). 

• Note: This is a catless downpipe and is intended for off-road / track use only. Please confirm your local emissions laws before installing.

• Recommended to pair this downpipe with a tune or professional calibration for best results.

What’s in the Box

• SPDZ1  High Flow Catless Downpipe (precision engineered, as described above).

• Full hardware/gasket kit for installation (bolts, gaskets, sensor ports).

• Extra O2 bung (for wideband/logging).

• Instruction sheet and support from Speedzone’s install team if needed.

Brand Guarantee & Ownership Confidence

When you buy from our 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 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!!