Better then stock but you are still picking up hot air from the engine on aceleration from idling. I think it's better if you can make some kind of seal panels to pick up air only from the out side.
I can not think of a way for my P yet but I made one for my BMW in the past. I am not sure how much this will gain you but consider it's a fun project. I used thin sheet of metal. In the inner side, I spray several thin layers of undercoat. On the engine side, I spray undercoats, then dynamat with thin aluminum sheets. On the top, I used weather strip and made it just meet with the hood. The air-box seals the cone almost completely from the engine. There was only a small area (on the strut tower) to let air escape for air flow.
... but anyone done anymore test to prove if this really gain anything on 911?
Quote:
Originally Posted by widebody911
This solution worked well with the Big A$$ Wing:
And the one I built for Jack
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