I went ahead with purchasing the best WMI system you can get on the market. You can get basic systems for $400AUD which use a an on/off pump to spray and work off boost pressure, but as we know boost tapers off at max rpm so that means flow of fluid gets smaller.
The system i got is a constant 160psi feed with a variable opening/closing injector. (same setup as fuel injectors with cars) and reads off injector duty cycle and boost.
I purchased it as there was a groupbuy, set me back $650USD ($720AUD)
Also need to throw in the water tanks, baffle, roll-over valves (dont want methanol spilling out when/if im upsidedown) and filters, so thats another $150~
SOOO looking at about $900~