Quote:
Originally Posted by andya
Interesting... I will take another look at the service manual because I remember compairing the 03WRX to the 05STI exhaust profiles and came up with the 10 degree difference... I could be wrong but the swap made a great improvement after tuning vs a WRX cammed vehicle with similar mods.
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Those pictures I posted above are from the service manual. It is possible you noticed the difference in open or close angle, not duration.
As I mentioned above, the swap will net more lift as well as less overlap at higher rpm, which will net more power. So you are not wrong as to the gain. It is as would be expected given the differences.
Jeff