What power gains does a BMC induction kit give?

[matth76 1]

Hi

As the title says does anyone have an idea what kind of power/torque increase their BMC cda induction kit made to their Golf VR6 or what difference any other induction kit made?

I'm thinking of fitting a BMC in the next 2 to 3 months (once xmas is out the way).

Also what length of cold air feed/ducting is required to reach to the bottom of the engine bay just behind the grill underneath the bumper?

Thanks for any info.

Cheers.

Matt