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Old 05-09-2002, 07:56 PM   #1
Onederer
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Default Equal Vs Unequal length headers

What are the pro's and cons of each system?
And why. Also, what if any audible difference is there?
Some one told me that the Equal length headers will take away that distinctive Subaru flat 4 sound.


Thanks

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Old 05-09-2002, 08:00 PM   #2
mlambert
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equal length tuned headers normally enhance the sound of a motor...but with a turbine in the exhaust path...i doubt it would sound much different.
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Old 05-10-2002, 02:13 AM   #3
wrx99
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Any headers on the wrx change the sound of the engine unfortunately. I made my own 1.5 inch diameter copies of the Zerosport design which are very unequal in length, and the boxer sound is only there at idle. It sounds very wrc-like at revs over 1000 and makes a lot more power. Be careful that you have your aftermarket ecu (if you have one) tuned to suit, otherwise the increased efficiency from the headers will mean that the motor will run lean. I had to add fuel at the top end and made about 20 more horses. The other advantage of headers (according to my tuner) is that the engine will rarely ping (knock, detonate) as easily as it will with the stock manifold from over advanced timimg. He reckons you'll lose power before it detonates if you keep advancing the timing.
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