Alta package question
 

I have a R56 or 07 cooper s with almost 60k miles and im thinking about getting the alta stage 2 package. I currently get between 34 and 37 highway (alot of highway to/from work) and I am currious if anyone has this setup and if they have noticed any change in mpg. Think it will improve because the ease of getting air in and out along with the cooler temps? Also, how noticeable are the power gains?

Appreciate any and all input.