Headers - Subaru WRX Forum
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post #1 of 4 Old 05-12-2017, 01:36 PM Thread Starter
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Hey everyone, I'm a bit new to the WRX scene. Just got a 2017 WRX and am looking for that Subaru rumble. I know I need different lenght headers. Any suggestions on which I should get? I wanna do headers, intake, and exaust all at the same time. Any tips or advice would be awesome. Thanks!
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post #2 of 4 Old 05-16-2017, 11:25 AM
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Please read this list about what you should do first. Learn about your car, it's still very new to the market therefor maxing at "Stage 2" for now.

UEL headers are what give it the rumble, catless up pipe to be reliable. Talk to your tuner, gather all mods, then get a protune and after a road tune.

But first, please read the links I sent.
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post #3 of 4 Old 05-17-2017, 02:06 AM
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In your case it would actually be a really bad idea to go UEL (even if you could, I don't believe they exist for your engine configuration).

Reason being is you have a twin-scroll turbo, which is a very nice thing but it requires equal pulses to go into both of the scrolls in the housing. It spools up much faster and produces very solid and reliable power. Not to mention the headers themselves being Equal Length produce a good amount of power just by being more efficient. I'm not even gonna go into how in an UEL one side, and one cyl in particular gets a lot more abused than the rest (when i blew my motor that side, and that particular cylinder were the first to go).

Putting on Unequal Length Headers into a twin scroll turbo would result in turbo lag and a major loss of power. Your car still has a subie rumble. Throw on a nice turbo-back exhaust and you'll be happy.
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post #4 of 4 Old 05-17-2017, 10:46 AM
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EL vs UEL sound completely different, while EL is designed for TS turbos you can use it but like Ruso said you WILL change your powerband significantly.

They make UEL headers for the BRZ/FRS/GT86 and they're the same block/heads, just N/A not turbo and funny thing is with UEL headers they make MORE power than stock due to UEL design increasing EGBP slightly and making more TQ down low/more flow up top.

Can UEL headers on a turbo car have issues, sure can...but the EJ257 STi still to this day uses UEL because it increases higher RPM flow where as the EJ207 lacks the TQ down low compared to the EJ257 therefor the EL/TS reduces that issue.

You need to decide what kind of driving the engine will be used for most before you decide how much money to drop on changing from EL to UEL, EL/TS for city is going to be much more responsive than UEL down low...while UEL is going to have more rumble and have higher HP number up top (which the FA20DIT doesn't even rotate past 7k).

Last but not least, the MAIN reason they went EL/TS on the wrx with the FA20DIT is it allows them to pass emissions easier here in the US. The EJ257 STi (USDM) still has UEL because Subaru has chosen it to be there one allowable "performance car" in their lineup, which is also why you see the STi having a catless up pipe and the wrx is still catted in its up pipe. Most manufacturers are allowed to have one car designed to be a performance machine and they allow less restrictions in terms of emissions testing.
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