Agreed, the Mao stuff is getting old, I've dealt with him 600km away and haven't had an issue. Guy saved me from buying a built bnr34 with fucked rings...

As for the filter I'm pretty sure I have a new K&N in the garage from an older project that I never got around to using it on. Will give that a go. I have used the oiled filters in the past with no dramas. Will probably find I'll be cleaning the maf even more but should be more comforting knowing I'm cleaning oil not dust from it