Do equal length headers make more power?
In Conclusion… Equal Length Headers appear to be the winner here. However, both headers will increase performance over stock, and both typically increase the sound of the exhaust. On most street driven applications, the increase in cylinder temperatures seen with a UEL Subaru header is negligible.
Do equal length headers require a tune?
no, you don’t have to. You’ll see gains from just bolting them on the OTS map and you won’t hurt anything.
What are equal length headers?
The equal length header is characterized by having all runners be the same length, hence the name. That means the exhaust gasses travel the same distance before they merge into the collector.
What is a UEL header?
For those who are new to the aftermarket scene, UEL stands for unequal length headers and EL stands for equal length headers.
Does the 2020 STI have equal length headers?
Registered. Yes unequal length headers. The 2020 STI still has the EJ257 engine.
Are tuned headers better?
A tuned exhaust header’s primary-tube length has a direct influence on engine performance. It controls where in the engine’s speed range the header will add performance. Longer tube lengths pull the torque down to a lower speed. Shorter lengths move the powerband up into a higher speed range.
Why do headers have to be equal length?
Equal length headers will give the car more power over their unequal length counter parts. This is due to the equal pulses of exhaust flow as well as keeping exhaust gases the same due to equal runner length. Equal length will allow the exhaust gases to flow smoothly and consistently.
Do exhaust pipes need to be the same length?
Bottom line, yes, the pipes should be the same length. Here is whatthe article says: “Assuming that an exhaust system is otherwise properly designed, equal length pipes offer some benefits that are not present with unequal length pipes.
Why do Subaru engines rumble?
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.
Can headers be too long?
Too large a header will reduce torque output of the engine and increase the possibility of exhaust gas reversion—again increasing heat. Simply put, torque is related to air velocity (the faster the air/fuel get through the engine), and horsepower to the volume of air/fuel that processes through the engine.