Does the 2020 WRX have unequal length headers?

Published by Charlie Davidson on

Does the 2020 WRX have unequal length headers?

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.

Why did Subaru get rid of unequal length headers?

Unequal Length Headers are typically lighter since shorter runners on two cylinders require less material. 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.

Do you need a tune for unequal length headers?

yes, you will need a tune. for any engine modification that is not a catback, retune/adjust the tune in the car.

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.

Are headers worth it WRX?

Installing WRX exhaust headers is a great investment if you desire a smooth sailing ride. The stock exhaust system may perform satisfactorily, however, if you want your car to realize its ultimate power potential, it is imperative to look at WRX equal length headers.

Why do Subaru engines rumble?

The gasses from pistons 2 and 4 are then only able to escape once their pressure has risen above that of 1 and 3, and then the gasses force themselves out. This process is what creates the infamous Subaru rumble, one of the best sounding (in our opinion) four cylinder engines of all time.

Why do Subarus sound so bad?

Why does it sound so different than any other engine on the road? The 2.5-liter Subaru engine makes use of something called unequal length headers, which are exactly what they sound like. The header piping from cylinders one and three are of a different length than those from two and four.

Do Subaru turbo engines have head gasket problems?

Although the turbo models do not suffer from the issues mentioned in this article, it doesn’t mean it can’t still have head gasket related issues – but it won’t be due to the faulty design. As with any turbo model Subaru, you’d want records that someone has been diligently maintaining it.

Can you run UEL headers without a tune?

You will be fine to run them without a tune. You may run into a CEL after a few hundred miles but it may be fixible with an 02 defouler. Having said that, I would no doubt go for the tune first over the header. The header is a great addition, but the tune is by far the best bang for the buck I have gone with.

Do headers need a tune WRX?

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. Performance exhaust header designed to reduce restriction for exhaust gases to flow.

Are aftermarket headers worth it?

The answer is yes, headers will boost performance – IF your vehicle is “prepared” for them. We discuss header types, their benefits, and conditions necessary for best results.

Are there unequal length headers on a Subaru WRX?

At the collector the pulses blow through and merge into the up-pipe which feeds the turbocharger. 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.

What’s the difference between factory and Performance Subaru headers?

The factory OEM manifold is designed as a cost-effective component whereas this Killer B Motorsport Performance Header is designed with the goal of maximizing exhaust gas performance and increasing power. The equal length twin-scroll design improves exhaust gas scavenging, increasing the engine’s ability to make power.

What’s the difference between Subaru WRX and Uel?

This is due in large part to the design of the headers, as a 4-2-1 design is more efficient in these areas than a 4-1 design seen with UEL Subaru Headers. Knowing what we already discussed about the different types of Subaru WRX/STi Headers, we can easily see how they will each sound differently.

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.

Categories: Users' questions