I have this bravo for the last 4 years, and about a month i am hearing a light turbo whistle in low speeds. 1,2,3 gear. After 2500 rpm sound disapears, probably because engine becomes louder. When radio is on, i dont hear the whiste. Does anybody have the same issue.i know this probably means nothing, turbo can last 100k miles more, but it is annoying a little bit. I have 80.000km kilometres. Pipes seems ok.