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RS 2.5L Equal to Unequal


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#1 Jayjay


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Posted 13 September 2016 - 02:56 PM

Was thinking of swapping my 2.5L equal length headers to Unequal length headers. I already know that the sound changes and it acheives more of the boxer "rumble" but are there any other benefits or differences that may occur, Whats involved in swapping the headers aswell... is a new midpipe needed? or will it bolt onto the stock midpipe w/ CAT? (i already have a WRX tailpipe with muffler, connected from stock exhaust system)  If someone has done this before would they be able to lead me in a right direction with what is needed or if its a waste please let me know :D


Cheers, Jayjay

#2 Niko


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Posted 13 September 2016 - 03:19 PM

Hey Jojo.


There's a thread dedicated to this in the NA part of the forum.




#3 Mr Gormsby

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Posted 20 August 2017 - 01:52 PM

Have played with this on a 11:1 EJ25 sohc. Performance wise the equal length, in my case, have the best torque and flatest power curve.

1989 Legacy/Liberty BF (wagon) daily EJ25 Bilsteins plus STI brakes and drive train

1990  Legacy/Liberty BF (wagon) spare car

MY02 Bug/Blob eye WRX Club Spec 5

1987 Brumby/Brat

1985 Brumby/Brat

1993 Daihatsu Mira L200 Sport Sedan

#4 duncanm


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Posted 20 August 2017 - 03:31 PM

ps: seven periods w/ Mr Gormsby is awesome

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