Yes i would go for a wizards kit.
They are suitable for DIY instalation and instructions on how to set up are given, quiet basic stuff at that level really.
Try it initially on 25bhp jets, then you can increase from there if its working properly, rather than risk anything on more power.
bottles are available write down to 0.5 lbs, even a 5l would be impossible to stealthily fit on a bike i suspect. unless you want it visible?
Personally, i would go for 2 * 11lb bottles in a "rocketman" style backpack