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  1. Saab 9-3 filter performance HELP

    9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    He guys so i have a Saab 9-3 2007 1.8Litre turbo engine ive installed a HKS blow off valve and 2 Apexi gauges so i really wanna install a filter performance and i want the normal rectangular K&N filer but when i select the options i dont get a 1.8 litre engine;oops: will it make any difference...