Generator Specs and EFIE Question (commercial hybrid kits)

[90j35938hw4]

I'm looking at commercial kits for use in my car, and determining which option to go for:


http://www.hybridfuelcells.com.au



Extreme 180x1 Hydrogen Dry Cell KIT
Titanium 5 Plate , 4 Cell Dry Cell Generator

no amp or lpm specs

http://www.greenfuelh2o.com/HHO_On_Demand_Generators_s/3.htm



Gfx1 19 Plate On-Demand V6 System
4x6 inch 19 plate
45 amp max
3 liter per minute

http://waterfuelforall.com


WaterfuelForall Standard max 25A, 20A @ 13.8V continuous, 1.6-2.2 lpm @ 20A
WaterfuelForall Deluxe max 30A, 25A @ 13.8V continuous, 2.0-2.75 lpm @ 25A
WaterfuelForall Super Deluxe max 35A, 25A @ 13.8V continuous, height 14.5"
2.0-2.75 lpm @ 25A


Can you buy a kit that has a generator rated for a higher output car, would this result in better fuel efficiency, or should you just stick to the kit with hho output rated for your car?

Second, is it absolutely necessary to add an EFIE to callibrate the air fuel ratio. Couldn't you just install the kit without one and instead get better hp/torque?

Lastly any opinions on which company has the best kits in terms of price, reputation and quality. Will need shipping to Australia.

Thanks.