What do unequal length headers do?
With an unequal length header, gas from the two longer runners will remain in the header as it will take longer to reach the collector. This results in lower cylinder temperature on an equal length header, which can help prevent ringland failure.
Do all Subarus have unequal length headers?
Unequal Length Header The factory header for most US market turbo EJ20 / EJ25 Subarus including the WRX, STI, FXT (Forester XT), LGT (Legacy GT), Baja Turbo, and Outback XT are unequal length. This includes the current 2.5L STI, but does not include the FA20 powered WRX / FXT.
Do you need a tune for unequal length headers?
A: Tuning is not required for the headers, but will be recommended to get the most out of the upgrade.
Does the BRZ have unequal length headers?
Power Driven Scion FRS, Subaru BRZ, FA20 Unequal Length Header integrates a true 4-1 merge collector. Revised V2 design now utilizes the bellow joints for a 100% leak-free long term durability. Independent customer dyno has shown to gain +28 whp and +14 tq, and with no more torque dip.
Are headers worth it?
In general, a quality set of headers should provide an increase of approximately 10-20 horsepower, and if you’re restrained with your right foot, you may even see an increase in fuel mileage.
Why do Subarus sound so deep?
The Subaru boxer is of the horizontally-opposed flat design. That’s only part of what gives it that unique sound, however, as it’s more about the design of the headers. The 2.5-liter Subaru engine makes use of something called unequal length headers, which are exactly what they sound like.
Are Tomei UEL headers Catless?
So I’ve been in the market for some new headers down here in Australia, and the Tomei UEL sounds amazing to me. The only problem is that it is catless.
What is special about a boxer engine?
Due to its low height, the ‘Boxer’ engine can be redirected under the floor of the passenger compartment avoiding any penetration of the passenger compartment and therefore reducing the chance of front occupant injury.
Why does my Subaru sound like an airplane?
When the seal is broken or damaged, the wheel bearing will fail and start making noise. Many describe this as an airplane noise, but others might say it is like driving over a rumble strip on the side of the highway or the whirring of a helicopter propeller.
How much hp does headers add to a Mustang GT?
Again, power gains are on the top end of the spectrum, but said power gains are very impressive. It is not uncommon to uncork an extra 30 to 40 horsepower with a good set of long tube headers.
