Honestly, you'll never feel any increase (if there is any) in HP from an air filter.
If you install something like the Evo Hi Flo (which I have), you will immediately notice an intoxicating howl every time you hit the throttle...worth the price of admission all day long!
Isn't that what's it's all about?
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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