BNM Performance Fab Twin Scroll Rotated Twist Mount Turbo Kit w/3.5" Down-Pipe

The BNM Performance Fab Twin-Scroll Twist Mount Kit is the ultimate turbo solution for Subaru builders aiming for elite-level performance. This is not just a turbo relocation—it’s a complete, purpose-built foundation for making serious power, engineered with precision to support large-frame turbochargers that simply won't fit in the factory location.

By moving the turbo to a twist-mount position, you gain the clearance needed for big compressor housings, oversized intakes, and high-output turbine sections—giving your build the airflow it needs to reach its full potential.

What sets this kit apart is its true twin-scroll design, delivering maximum efficiency and response. Exhaust pulses from each bank are kept completely separate as they flow through the headers and into a divided T4 turbine housing. This setup minimizes interference between pulses, improving exhaust scavenging and allowing the turbo to spool faster, even at lower RPMs. The result is quicker boost onset, stronger midrange torque, and seamless power delivery all the way to redline.

The system uses dual 40mm external wastegates, which provide precise and stable boost control under high load. Whether you’re dialing in a flat torque curve or pushing peak power at high RPM, this layout gives tuners the control needed to get it right. The wastegates vent through screamer pipes to atmosphere, producing that raw, aggressive tone that serious turbo cars are known for.

To support the increased flow demands, the kit includes a high-flow 3.5" exhaust outlet pipe, designed specifically for use with universal 3.0" V-Band outlet turbine housings. This outlet pipe ensures a smooth, unrestricted path for exhaust gases leaving the turbo, reducing backpressure and supporting top-end power. Oxygen sensor bungs are pre-installed to support factory and aftermarket sensor setups, and the pipe is sized to connect directly to your factory-style cat-back exhaust system.

Turbo Compatibility:

• Supports turbos with T4 divided turbine inlet and 3.0" V-Band outlet
• Compatible with units from Garrett, Borg Warner, Turbosmart, Pulsar, and other brands using the same flange configuration

Wastegate & Fabrication Requirements:

• Designed for dual 38mm–40mm external wastegates (e.g., Turbosmart WG40, GFB EX38)
• Requires custom intake and intercooler piping to suit your turbo setup
• EJ20 vehicles running equal-length headers will require a 2.5L "triangle" sump or aftermarket oil pan for fitment clearance

Important Note on Screamer Pipes:

The included screamer pipes vent directly to atmosphere and are not legal for road use in most areas, as they bypass emissions control systems. For street-driven cars, additional fabrication is required to plumb the wastegate outputs back into the exhaust system. Track users should confirm local decibel limits, as screamer pipes are extremely loud under boost.

Installation Notes:

• Gaskets and hardware are not included
• OEM gaskets and fasteners may be reused if in good condition, but replacing all sealing components is strongly recommended to ensure proper fitment and long-term reliability

About BNM Performance Fab

BNM Performance Fab is built on a simple principle: do the job right, or don’t do it at all. Every part that leaves their workshop in the USA is hand-fabricated by a team that lives and breathes high-performance Subaru tuning.

This isn’t mass production. It’s precision fabrication using premium 304 and 321 stainless steel, shaped and welded with care, one piece at a time. From the first cut to the final weld, BNM components are crafted with a deep respect for quality and performance.

These parts are designed for builders who push beyond the factory limits. They’re made to take on high heat, serious boost, and the wear that comes with hard driving. Fitment is spot-on, with designs that install cleanly without modification or frustration.

BNM’s attention to detail is where it really shows. The use of thick, oversized, laser-cut flanges helps eliminate common problems like warping or exhaust leaks, even after countless heat cycles. Every weld, every cut, every finish is made to last.

Whether you’re upgrading a daily driver or building a full track car, BNM parts are built to support your goals now and into the future. They’re trusted by Subaru owners and engine builders who refuse to settle for generic bolt-ons. If your setup demands strength, reliability, and real craftsmanship, BNM delivers.

General Notes:

• EJ20 vehicles require a 2.5L "triangle" sump for fitment