evenin' all.
been thinking about the air filter setup on my 1.8 coupe (Z18XE) and was wondering whether i should buy something like a pipercross viper or a BMC CDA (perhaps a pipercross venom if i'm feeling cheap) or build my own kit.
the idea i had was to base it around a mahoosive 250mm green cotton powerflow cone http://www.green-filter.co.uk/produc...ucts_id=100290
with an airbox made out of some 150mm acrylic tube.

does anyone know the filter dimensions for the CDA, viper and venom? i thought possibly if i could fit a larger cone in a home made airbox i might see some more substantial gains.