Has anyone Dyno tested this mod and if so how much HP gain can be expected? Is there also a throatier sound like that of the MotorSound Option?

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I am not sure.

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- Nick

Fabspeed claims 8hp with their open airbox system. I have seen several threads on this or drilling circular holes in airbox cover, from what I can deduct it's more sound than any real hp gain.

Porsche 964 Carrrera with Fabspeed CUP Airbox - YouTube

Your best bet for hp gain is Cat-by-pass pipe and primary muffler by-pass pipe.

Yes, and pigs can fly. :-))

Save your money, and buy the cat bypass/ muffler bypass as Type 911 said.



http://forums.pelicanparts.com/suppo...s/beerchug.gif

Yes it's been dyno'd (per Steve Weiner of Rennsport Systems) and is effective for 2-3hp. Sounds b!tch'n too!