I had a K & N panel filter in my '97 n/a SW20 for many years. Just took it out every 50,000 km., cleaned and re-oiled it with the special kit you can get at Supercheap Auto for around $10. Never had a problem.
Won't give you any more power but will save you buying a Toyota one every 20,000km.
They will last forever but don't put too much oil on them. Kit instructions are very specific.
