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Read the commentary at the end.
Bottomline, unless you are running a monster drag motor, stock is better.
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
P.S. A FIPK style may still give you a small power increase because it is feeding cooler air into the motor and not because it has superior flow.
And I got this from a Titan board so I can't take credit for it.
Bottomline, unless you are running a monster drag motor, stock is better.
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
P.S. A FIPK style may still give you a small power increase because it is feeding cooler air into the motor and not because it has superior flow.
And I got this from a Titan board so I can't take credit for it.