Header/Exhaust combo power difference?
 

I think i need to re-phrase my question.

Which headers, based on engine size and HP, would be the best fit for a 2015 FRS for max HP gains, with adding an exhaust and a tune afterwards?
(I am reading through previous posts, not just bypassing information)
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We all know that different headers and or exhausts, and combos of, will create different sounds. I'm having a difficult time finding if any combo of each will produce more or less HP than another combo.

Does it matter and they all basically produce the same power and only the sound and visual is different?

I want more HP gains over the importance of how it sounds.

Currently I like these: Borla UEL Header/Magna Flow Exhaust, Borla UEL Header/Berk Exhaust (don't know a lot about Berk though). I'm also liking the Invidia R400 catback or the Tomei Type 60-s (although i like the 2 pipe look better).

Note: I do not plan on super charger/turbo or E85 conversion.

Following

Fyi a tune can differentiate how much gain can be made.


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Yes, forgot to mention I will also be getting a tune after.

For the most part, any changes in power are dependent on the header alone. Everything afterwards will have a minor impact, if anything.

Can you recommend any that I can research?

Spend a few hours on YouTube searching "BRZ catback"

Exhaust is like underwear - it's something only you can decide fits and feels comfortable for you. Different styles appeal to different people. I run a stock catback and think it sounds great. Others need 3" straight pipe to feel happy. Some people (like me) prefer single exit, some like dual, or quad.

Browse ft86speedfactory http://www.ft86speedfactory.com/exha...-backs-72.html , then YouTube the exhausts you like.

Yes, I have been as well as on here and there's one i like. More interested in the power gains first.

Catless headers will all be within a few HP of each other. I'm partial to JDL's offerings. They have a new 4-2-1 EL header that seems to be doing quite well. Personally, I've used a JDL UEL header for several years and have no complaints. Previously dynoed at 203whp on E85. Currently around 192whp on 92 octane.

They don't sell the uel anymore right? I wanted it cause it was 3" but thought I saw they don't make it anymore?

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Headers for power gains. Catback gets you nothing, this factory exhaust is not restrictive for under 220+ whp in my findings

As far as power goes I think the Ace A350 header still holds the crown. Although JDL's new 4-2-1 looks promising. After the header there isnt much to be gained performance wise. Mostly comes down to personal preference but Perrin released a blog showing 3" had some power gains over 2.5"

https://www.perrin.com/blog/post/3-0...d-stage-3-tune

JDL still sells their uel header. I believe they can custom make the collector 3" if you ask for it

Just FYI "Keep in mind that all these tests are done with the stock header (contains a cat), and front pipe with cat!" it looks like these gains don't come from the header unless I missed something.

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I've been reading EL is better for performance.

Thanks, I'll take a look and compare.