YDYBB Unequal Length Header for 2022–2025 Subaru WRX

The JDMuscle YDYBB Unequal Length Header is the performance upgrade for WRX owners who want it all — more power up top, increased torque with tuning, and that iconic rich, deep rumble sound. Built from SS304 stainless steel and available in Single Scroll or Twin Scroll configurations, this header is compatible with both MT and CVT transmissions and can be installed with the stock exhaust.

Quick Specs

• SS304 stainless steel construction
• Available in Single Scroll and Twin Scroll
• Instant HP gain and increased torque with custom tuning
• Iconic rich and deep rumble sound
• Can be installed without a tune
• Compatible with stock exhaust
• Gaskets included
• Note: Undertray vent removal required for clearance
• Single scroll performs better at higher HP; twin scroll torque comes in slightly sooner

Dyno Results — Dmann Tuning

Testing performed on a fully built 2022 WRX on E50 with ETS Intake, GESi J-Pipe, ETS FMIC, and Cobb catback.

• Baseline (stock manifold): 407whp / 436wtq
• After JDMuscle UEL header (no tune changes): 417whp / 413wtq
• After simple tuning adjustments: 418whp / 468wtq

"If you're a UEL fan and you're going to do it regardless; well, at least this one makes a touch more power. Furthermore, with some additional clever tuning, the TQ loss can almost be completely mitigated to the point of 'almost' being negligible." — DMann Tuning

Disclaimer: The negative effects of going UEL are still unknown since the last gen. / DMann Tuning

What's in the Box

• 1x JDMuscle YDYBB Unequal Length Header
• Gaskets

Fitment

• 2022–2025 Subaru WRX (MT & CVT)

Warranty

• JDMuscle Lifetime Warranty & Product Support