HPP is kinda a glorified fan switch for how much it costs when there are good tuning options out there for these cars for not much more money.
if you have an a4 it'll help more due to being able to change shift points and stuff.
i'd just get a good tune on the car rather than spend over 300 bucks or what not on that thing. as an M6 car all it'll really do is raise yoru limiter, adjust your speedo if you changed gears, turn your fans on sooner, and get rid of your speed governor.
__________________ 98 WS6 6 speed street car 2014 VW GLI Autobahn