Alright bud i'm giving the spec s a service there and was wondering about filters not many of the online parts stores list the s15 spec s for service parts, are the filters the same as on the s14a. wheres the best place online for service parts, plus is it possible to change the diff oil on the spec s? can you recommend the best induction/exhaust befor ei get NEO AIR/FUEL adjuster. what number kind of engine and gearbox oil do i use as in what xxWxx number should they both be for normal road use? cheers sorry about the big pile of questions but its hard to find straight answeres.