Just learned out about this THING,it improves gas mileage,power boost and even cleanes your engine and you can even use windshield cleanser and virtually no weakness. It is like the god-given kit ?

But true?

What is the best set for our XJR?

 

I think the water/meth is not really needed unless you are doing serious modification, but that's just my thought. performance gains would not be noticable unless you were continuously running your car very hard. and it would not be really a gain, but rather an avoidance of loss of performance as heat increases.

as far as the "best" system I have heard good things about snow performance. I am also involved in Volvos and a lot of people on that forum have used some type of AEM kit.

since this is a universal type install, it does require some modification/fabrication to fit everything. you have to put a pump somewhere, and a tank, and wiring for everything. If you get the "progressive" injection that complicates the setup

there are also multiple types of kits, some kits just spray in the mixture at a fixed level, others adjust the spray based on inputs from some type of sensors, I think that is called "progressive" meth injection.

hopefully someone that has actual experience with this will chime in, but that's what I've picked up on over the past few years

 

I am leaning on the option of the AEM system

Is the installtion compliacted?