Which do you guys like the best? I have never had a problem with the mazdas but we all know they are a little high. RA/Mcmastercarr seals are a bit cheaper but i have had a few inners go bad, on the other hand i have been able to reuse quite a few with no problem. Then there are these http://www.tuningsessions.com/ I think i will use these on a test build to see how they act and give some feedback.