Apexi
Blitz and HKS have v.poor filtration
Sombody maybe Brad had the apexi induction pipe spare. If you can get hold of one then just by the universal Apexi filter and bolt it straight on. Or use the existing induction pipe (may need a little thought).
http://www.mkiv.com/techarticles/filters_test/2/
http://www.nengun.com/apexi/power-intake
[img]http://i2.ebayimg.com/04/i/000/a7/11/6fc1_1.JPG[/img]