how user freindly is it? - Very easy to use
how's the power? - night and day difference from stock, stage 2 is a big improvement over stage 1.
how's it compare to other packages? - Dont know, only used Cobb.
how loud is the exhaust? - I have helix flex uppie, stromung short d/p with twin dump and stock from there, car is very quiet-same as stock.