JDMuscle

JDMuscle [22-25 WRX] YDYBB Unequal Length Header - MT&CVT

$599.00 USD

~~$899.00 USD~~ $599.00 USD

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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