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http://www.mazda-speed.com/forum2/index ... 706.0.html

I am waiting for my FM O2 to do this mod. I never bothered with the O2 mod. before because it didn't seem to be a complete fix and my hesitation is pretty small beer anyway.

Anyone else done this yet?

Didnt need to.
O2 Mod fixed hesitation. Very smooth even delivery now.

Ah! Just remembered a very important point; the SE only has one O2 sensing point and the USA version has a second one in the mid-section of the exhaust system. I had to plug it on mine when fitting the FM system. I'll hold off until the Spring since my car is going so much better with the departing frosts.