Lets go for the intercooler question first:
Once a performance intercooler is installed, the denser air it delivers is free.
How many liters of methanol would you like to burn per moth or year to get the same power ALL the time?
There is no empty NOZ bottle or no empty Methanol container as its permanent performance.
And all depends on WHAT intercooler you install.
For the R53 as an example we do recommend to change intercoolers to a front mount version for maximum efficiency.
Only THEN you will see performance improvements!
What do you expect from a miniature pincher like this:
Compare it with our WT intercooler and you will understand!
BTW.... intercooler performance can not or hardly be measured on static dynos; you got to feel it to believe it!
Now to the water / methanol injection:
Yes it i very efficient but also limited if you don't want to carry a 20 liter drum in your car!
WMI is just like NOZ intended to give it a kick in the backside when needed.
In addition to an intercooler it's the ultimate..... that I've got to admit :idea: