These small time tuners like Shiv and Terry are never gonna be able to compete to Cobb or other big tuners. For some reason these two guys dominate this industry. Cobb isnt wasting too much time on the n54/n55, they have gtr's to tune.
Piggybacks are caveman technology, flash is the way to go, but no company devotes the time to make a proper flash. Cobb did a good job on the n54, but it still isnt perfect.
Guys get a jb4, atleast Terry answers emails. Vishnu has In my opinion a better product, but nobody should deal with their horrible customer service, and no big company is gonna waste their time on the n55 to make a proper flash. Jb4 is the best option.