You want to change filters often so there isn't a dirty filter in there to restrict more. You can buy a number of higher spec stock filters that have heavier casings like Purolator Boss, Royal Purple, Mobil M1 and others, without going to a racing filter. You want a filter with a good flowing bypass valve also, just in case, not a tiny little hole like some have. My pick would be a RP probably. My 2 cents.