I did state the car was a JDM 03 STi and that it was designed for this specific model and it was running its standard JDM map also
New age JDM's are very resticted with the standard filter in, hence the STi part and also why its a Jap domestic market performance upgrade (like the GeNome exhaust back box for example )

Tony

 

Now then,I've got one of those and that*did*improve throttle response and pick-up a little bit

Jon

 

If Mike Wood says a Standard filter is good enough for Prodrive then its good enough for my STI PPP.

 

Are the filtration properties of a green filter acceptable/similar to a standard filter or are they questionable.
Nik.

 

ive just recently got the green panel filter 4 my wrx could not tell any difference not that i was expecting any with the change,most companies will tell u to put some sort of aftermarket filter on they r a business after all.but my car must be alot happier with the new filter on so go 4 it, if u want more noise go 4 a cone filter

 

im going for a KnN end of!

 

I would say that nothing beats a pleated paper filter for filtration performance. I would worry about aftermarket 'performance' and possibly low filtration filters.

 

I think you got it right first time Elmer.
The results were not what I expected but I had done the testing carefully and was confident about this. Because the results were not as expected, I repeated the tests next day in a different running order, not that that should have made any difference. I was surprised to get the same figures second time around.
It was nice of Mike Wood to come on and say my findings were generally in line with Prodrives which I knew nothing of at the time. It stopped experts or spiv salesmen with a vested interest, telling us that a particular panel filter would add loads of power.

I have done subsequent tests and conclude that the filtration from the O/E Subaru, K+N oiled panel and STi are excellent. The best performer had the worst filtration and the O/E Subaru was the second best performer. If I were to run other than O/E Subaru it would be K+N but only because it is reusable. The disposable STi is an expensive option for no power gain.

Subsequent tests lead me to believe that at 350 bhp on a Classic and perhaps even more, the O/E air box is not a restriction and may be a better option than a cone. A similar figure on a New Age seems to be nearer 400bhp but these tests are not fully completed.