PLM Power Driven FR-S BRZ 86 GR86 FA20 Unequal Length Header

If you want the classic uneven boxer sound and you are trying to improve the FA20's low- and midrange response, this is the PLM header I would look at. The one-piece unequal-length layout replaces the factory manifold and bolts to the overpipe in the stock location, so it is a straightforward way to address the factory restriction and torque dip.

PLM's revised V2 design uses dual bellow joints to handle engine movement and reduce the chance of long-term cracking or leaks. The true 4-1 merge collector, 2.5-inch outlet, mandrel-bent 18-gauge 304 stainless tubing, CNC-machined 0.38-inch flanges, and TIG-welded construction give it the hardware I want to see in a budget-minded performance header.

Why I would choose it

• Unequal-length layout keeps the traditional Subaru boxer tone
• Designed to improve low- and midrange power and reduce the factory torque dip
• One-piece, direct-replacement design saves space and simplifies installation
• Dual bellows help the header survive normal engine movement
• Includes PLM's one-year warranty

Fitment and tuning

• 2013-2021 Subaru BRZ
• 2013-2016 Scion FR-S
• 2017-2021 Toyota 86
• PLM also lists and has confirmed 2022+ BRZ/GR86 fitment

For a 2022+ FA24 car, I would normally choose PLM's FA24-specific 48 mm-primary version because it is sized around the larger 2.4-liter engine. Plan on tuning the car after a header change. PLM cites independent customer testing of up to 28 whp and 14 lb-ft with the torque dip removed; actual results depend on the rest of the combination and the tune.