Polished stainless 3-inch catless T3 turbo downpipe for Subaru WRX and STI with a GT35 or GT35R turbo, with a flanged inlet, braided flex joint, and two gaskets
Stainless catless T3 turbo downpipe with a four-bolt turbo flange, an oxygen-sensor bung, a braided flex joint, and two gaskets
Polished stainless T3 turbo downpipe with a three-bolt flange, a braided flex joint, and an oxygen-sensor bung, shown without gaskets
Stainless catless T3 turbo downpipe with a braided flex joint and two gaskets for the Subaru WRX and STI GT35 turbo
Polished stainless T3 turbo downpipe with a wide mandrel bend, a braided flex joint, and an oxygen-sensor bung
Stainless T3 turbo downpipe standing vertically with a four-bolt exhaust flange, a braided flex joint, and an oxygen-sensor bung
Two stainless mesh exhaust gaskets, one triangular and one oval, supplied with the T3 turbo downpipe
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Polished stainless 3-inch catless T3 turbo downpipe for Subaru WRX and STI with a GT35 or GT35R turbo, with a flanged inlet, braided flex joint, and two gasketsStainless catless T3 turbo downpipe with a four-bolt turbo flange, an oxygen-sensor bung, a braided flex joint, and two gasketsPolished stainless T3 turbo downpipe with a three-bolt flange, a braided flex joint, and an oxygen-sensor bung, shown without gasketsStainless catless T3 turbo downpipe with a braided flex joint and two gaskets for the Subaru WRX and STI GT35 turboPolished stainless T3 turbo downpipe with a wide mandrel bend, a braided flex joint, and an oxygen-sensor bungStainless T3 turbo downpipe standing vertically with a four-bolt exhaust flange, a braided flex joint, and an oxygen-sensor bungTwo stainless mesh exhaust gaskets, one triangular and one oval, supplied with the T3 turbo downpipe

Flashark 3-Inch Catless Downpipe for Subaru WRX / STI with GT35 or GT35R Turbo, T3 Housing

SKU: FLES08380-ES08220-ES08189
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SKU: FLES08380-ES08220-ES08189
Product A: Downpipe
Product B: Exhaust Header
Product C: Cat-Back

⚠ Please verify full vehicle fitment before placing your order.

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Product Specifications

FLASHARK Turbo Downpipe Exhaust for Subaru GT35 & GT35R 3 Inch

Built for Subaru WRX and WRX STI turbo-upgrade projects, this Flashark 3-inch catless downpipe is designed specifically for Garrett GT35 or GT35R turbochargers with a T3 turbine housing. It replaces the restrictive exhaust section after the turbo to support a freer-flowing 3-inch exhaust path.

Constructed from T-304 stainless steel with mandrel-bent tubing, a CNC-machined T3 flange, and TIG-welded joints, this downpipe is made for performance builds that require a durable connection between the upgraded turbocharger and a compatible 3-inch exhaust system.

  • GT35 / GT35R specific: Requires a Garrett GT35 or GT35R turbocharger with T3 turbine housing.
  • 3-inch full-diameter design: Supports a compatible 3-inch cat-back exhaust without a neck-down section.
  • T-304 stainless steel: Built for heat resistance, corrosion resistance, and long-term performance use.
  • CNC-machined T3 flange: Designed for the required GT35/GT35R turbo outlet connection.
  • O2 sensor bung: Includes one M18×1.5 O2 sensor bung with plug.
  • Installation hardware included: Turbo outlet gasket, downpipe-to-exhaust gasket, bolts, and nuts are included.

Important: This is a catless downpipe for a GT35/GT35R turbo conversion. It does NOT fit a stock turbocharger, including VF-series or TD04 units. ECU tuning is required after installation. Intended for off-road or track use only; check local emissions regulations before purchase.

What Does This Downpipe Do?

The downpipe is the critical exhaust section between your turbocharger's turbine wheel and the rest of the exhaust system. The factory EJ257 downpipe is 2.5" with a restrictive catalytic converter—it's the single biggest exhaust bottleneck on a GT35-powered build.

By replacing it with Flashark's full 3" high-flow downpipe:

  • Backpressure drops significantly → turbo spools faster, holds boost longer
  • Exhaust gas temperature (EGT) drops → safer for high-boost tuning
  • Mid-range torque improves → the GT35's sweet spot becomes accessible
  • Power gains: 150–200 WHP over stock (GT35 + downpipe + proper tune)

Designed for: Garrett GT35 (standard bearing) and GT35R (ball-bearing) turbochargers with T3 turbine housing flange.