how much is the fluid then?? Do you need to compliment with HPFP, etc??
Cheap as chips to run dude. Meth £20 for 25ltrs and demineralised water £15 25ltrs. Mix it 60% meth and 40% water set it up to inject only on full boost/power and the fluids could last 6+months.
It can also be mapped in via the ecu and using the AIT sensors as a trigger to add 4-6deg more timing on full load which can works our to 25lbft and 20+Bhp at points. Even on a stock / stage 1 car it's well worth the investment IMO.
I managed to run a 1.8t ko3s to 340lbft 264bhp with 70/30 mix WMi and some trick mapping. It made one of the other top 1.8t tuners jaw drop when we ran it on his dyno.
So you can just bolt it on to any car and use it to aid charge cooling and timing corrections which keep the engine more effichent, or to get its full potential map it in and see nice power gains.
Another advantage with WMI is that it keeps the inlet side clean, it stops carbon build up on the back of the inlet valves.. Which for £250 investment and £50-100 a year to run is one of the best mods ever for a tfsi / GDi engine. It's just strange how not many mk5 tfsi owners are not running it. Lots of 1.8t owners are taking advantage of WMi setups.