How durrable is the Mazda3's engine?
I've been reading about how many import engines such as the SR20DETT, 2JZ-GTE, 4G63, and Honda B-series engines are so robust in construction, that they can safely be tuned to make incredible power. I was wondering, how does Mazda's 2.3L MZR measure up? For instance, is it safe to do things like apply 20+psi of boost or spin it to 9000rpm without needing to upgrade internals?
Would someone with real experience answer my question? (What I mean is, no speculating or telling me I'm an idiot for not already knowing.)
Thanks.