Anyone working on tuning??

[acrbill]

It has already been proven that bolt ons and head porting are not much help. Some Scion guy tried all sorts of mods and only made a few HP for several thousand dollars outlay.

The head design is probably a limiting factor and the tune almost certainly is.
There is nothing you can do about the head design unless a head from another car would work.

A piggyback is probably not a good answer since most cannot control timing and change the rev limiter.

Lastly, saying the engine can handle x amount of HP since some guy with a turbo put it down does not mean the engine will survive an all out N/A build.
N/A motors (I'm talking about small 4 cyls.) need to spin to very high RPM's to make power. High RPM puts a lot of stress on internal parts.