This is also the reason Mazda really over-built these engines, strength wise. They use very well engineered parts, like the pistons and rods, for example.Think if you are Mazda and you just bet the company's future with +13:1 compression ratio engines. Can you afford the bad publicity from even a few engines blowing up? They just went through that a bit on the RX8s. That is why they are crazy conservative with these engines.
The higher RPM isn't an actual strain on the physical parts (our boosted sky 2.0L revs over 7000 when stock limiter is 6400), it's that these heads weren't built to flow in such high rpms, as opposed to a honda, which are specifically built to maximize high RPM flow
Any Admins who could PM me? I am getting a lot of people who want this tune, and everything is pointing towards a group buy setup, but I'd like to pm/speak to an admin or mod to make sure everything is ok with that.