BNM Performance Fab 3-Bolt Unequal Length Headers (No Up-Pipe)

The BNM Performance Fab 3-Bolt headers are a high-quality upgrade for Subaru EJ-series turbo engines, offering a seamless blend of factory-style fitment and serious performance gains. Built by hand in the USA using premium stainless steel, these headers are engineered for enthusiasts who demand more from their setup—without sacrificing reliability or ease of installation.

Designed around the popular aftermarket 3-bolt flange standard, these headers offer broad compatibility with a range of proven up-pipe options from brands like PSR, Tomei, Roger Clark Motorsport, and ETS. This flexibility makes them a perfect choice whether you're completing a full custom build or replacing a damaged system. Note that an up-pipe is not included, allowing you to choose the best option for your specific needs and turbocharger configuration.

BNM offers these headers in both equal and unequal length configurations to suit different performance goals. Equal length headers improve flow balance and are ideal for top-end power and track use. Unequal length headers retain the iconic Subaru "boxer rumble" and provide quicker spool, making them a favorite for street-driven builds. Both versions feature a true 4-1 merge collector, expertly fabricated to direct exhaust gases efficiently toward the turbo for faster response and increased power potential.

Fitment Notes:

• Bolt-on installation for EJ20 and EJ25 single-scroll turbo engines when using the unequal length version.
• EJ20 owners installing equal length headers will require a 2.5L-style "triangle" sump or aftermarket oil pan to ensure clearance.
• Compatible with most aftermarket 3-bolt up-pipes. (Up-pipe not included.)

Installation Notes:

• Gaskets and hardware are not included. While OEM accessories may be reused if in good condition, it’s strongly recommended to replace all gaskets and fasteners during installation for optimal sealing 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.