Too much work to find the suitable adapter.. Benefits of an oversize filters are debatable, 'bigger doesn't always means better' *wink*wink*. A branded quality filter will do its job just fine.
what does 'SP oil' means, sorry im new here
As for keeping up with the revs, i was told not to go into boost in 4th gear or above below 3000, that will help from lugging and warming up going into boost.
finally over the anxiety of the first post.
i think over here in canada all napa proselect(regular) lineup of filter are all mahle, not sure about gold(regular+) or platinum(synthetic) lines
just recently bought a 2006 mazdaspeed 6 with 250k km's on the dash (i know that a lot for a turbo engine). As far as the reliability is concerned, the car was well maintained by the previous owner. Car has no issues with the vvt atcuator (common for all speed's). The MZR engine requires 5W30...