Do STIS have equal length headers?

Equal Length Header The Japanese STI features an equal length manifold design on its high revving 2.0L EJ207 engine to improve some aspects of the powerband. The equal length header is characterized by having all runners be the same length, hence the name.

Do you need a tune for equal length headers STI?

yes, you will need a tune.

Are equal length headers worth it?

Equal length headers will help smoothen out the power band once the car is tuned, even on stock turbo with bolt ons. You can normally see a slightly quicker spool time and lower cylinder temps when comparing to unequal length headers that come stock.

How much HP can a 2004 STI handle?

It will handle near 400-450 HP crank like sphinx said.

What’s better equal or unequal headers?

Unequal Length Headers are typically lighter since shorter runners on two cylinders require less material. Equal Length Subaru headers will perform better at mid RPM, with slight loss at higher RPM’s.

Why are unequal length headers bad?

The unequal lengths makes 2 cylinders flow differently then the other 2 cylinders. Ideally you want all 4 flowing the same amount and rate, equal length headers will balance the flow.

Do equal length headers add horsepower?

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.

Do you need to tune after headers?

That’s a very common question for car enthusiasts. And for aftermarket headers, the answer is yes, you should tune your car when installing a new exhaust header. Major performance mods like a header can significantly alter important variables like air/fuel ratio.

How much HP can an STI handle?

Skim through the Subaru forums and you’ll find the question on so many STI owners’ minds, “how much horsepower can my EJ257 handle?” The answer is different for everyone, but the general consensus is that the 400-450whp range is when you might want to clear out the garage and get ready to pull a motor.

Are unequal length headers bad for your engine?

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.

Are UEL headers bad for your engine?

Simple question right? One thing that is only lightly touched upon is the fact that UEL headers can cause unequal heat zones on your engine block, due to the difference in heat dissipation caused by the different length pipes.

How does an equal length Subaru header work?

An equal length Subaru WRX/STi header will expell gases at an equal rate per pulse, with gas from each cylinder leaving the header at the same time. 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.

Which is better Subaru headers or UEL headers?

Two shorter runners also means less engine RPM required to get exhaust gas to the turbo, so you’ll see quicker turbo response with a car running UEL Subaru Headers. This is usually around 200-300rpms, but those few RPM’s can be vital for cars that require a quick spooling turbo.

Can a stock Subaru header be replaced with an aftermarket one?

Replacing your stock header with an aftermarket one will increase HP and decrease turbo spool-up time. This Invidia header does not ship with an uppipe. You will need to purchase one separately. It will work with any uppipe that will fit a stock manifold.

Which is better an equal length or unequal length header?

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.