Quote:
Originally Posted by wdb
I was ready to believe it to be honest, possibly because of my experience with the STi. Subaru puts a baffle plate over the entrance to the downpipe, where it bolts to the turbocharger exit. That plate blocks off about half of the opening and strangles the engine at higher RPMs. A downpipe (+ tune to prevent leanout) on an STi is an instant 30+ HP increase, and can really be felt above 4000 RPM.
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Well...part of what he said is true - there is a charcoal filter above the regular air filter
You can remove that to see if you can feel any gains
