the best way to go is to see how other poeple like thier filter...
i would go with the K/N fipk look at all the positive feedback it got
http://www.suprasport.com/product.as...d=135&catid=49
compared to the HKS
http://www.suprasport.com/product.as...d=133&catid=49
also...blitz...
http://www.suprasport.com/product.as...d=132&catid=49
go with the blitz or the K/N b/c thats what people like the best all around
btw...all the filters
http://www.suprasport.com/view_category.asp?cat=49