JDMuscle Unequal Length Header - Subaru WRX MT & CVT 2022-2025

Introducing the JDMuscle 22+ WRX YDYBB Unequal Length Header – the ultimate performance upgrade for your Subaru WRX. Crafted with precision using high-quality SS304 stainless steel construction, this header is designed to optimize exhaust flow and unleash the full potential of your vehicle. You Do You Boo Boo! If you are not about full performance and have been craving that iconic rumble sound from your childhood memories, look no further! 

Quick Specs

• SS304 construction
• Instant hp gain and increased torque with custom tuning
• Iconic rich and deep rumble sound
• The undertray vent will need to be removed for clearance due to limited room (see 7:30 of the video TMG posted for reference)
• Gaskets included!
• These headers can be installed without the need for a tune.
• Headers are able to be installed with the stock exhaust!
• Per our testing single scroll will perform better on the higher end hp while twin scroll's torque comes in a tat sooner

When paired with custom tuning, you can expect an instant horsepower gain and increased torque, taking your driving experience to a whole new level. Feel the power surge as you accelerate, and enjoy the thrilling sensation of boosted performance on the road or track.

As a cherry on top, this unequal length header delivers an iconic rich and deep rumble sound, adding a distinctive character to your WRX that will turn heads wherever you go. Embrace the growl that matches the beast under the hood and experience the symphony of power and style.

Upgrade your WRX with the JDMuscle 22+ WRX YDYBB Unequal Length Header and unlock the true potential of your vehicle, whether you're a performance enthusiast or simply looking to enhance your daily driving experience. Get ready to dominate the streets and leave a lasting impression with this high-performance upgrade. 

Comments from Anthony / Dmann Tuning who performed testing:

"Okay, for initial testing of the JDMuscle prototype we used a FBO 22 WRX on E50. The vehicle was loaded with our “standard” E50 ProTunes. The vehicle had an ETS Intake, GESi J-Pipe, ETS FMIC and a Cobb catback before installation of the header and with no other changes. No kill maps were use and this tune we used is something we would generally have as a completed tune on a customer vehicle for sake of comparison to apples to apples. The vehicle made 407/436 at the tire twice on both baseline runs. After the addition of the JDMuscle UEL header; the car produced 417/413 at the wheels. (You can see below in the pull data it was done the same day within 3 hours apart with similar weather conditions) The obvious and expected loss of low-end moving from an EL/twin scroll to a single scroll/UEL design was actually less than anticipated. I will comment on the fact the vehicle did make more power up top with no tune changes as a result of the larger manifold sizing.

After some simple tuning modifications mainly to the WG initial table to smooth back out the boost onset and attempt to bring it in sooner and adding another .5psi down low (no timing changes) netted a whopping 418/468 at the tire and mitigated the low end loss to a minimum. To be fair, with the stock manifold, the tq increase if the same tune was placed on the car would total net about the same. Concentrate more on whp above the curve and mitigation of the low-end loss. As we all know, there will always be a loss from going from a twin-scroll EL, to a single UEL. This fact is irrefutable. However, the 2.4s extra displacement and redesigned turbo (E-WG) loses are much less than the “expected loss” when compared to a FA20 with a Tomei UEL for example. Also note, the chart looks exaggerated due to the nature of the auto-scaling.