Well got the itg and stage two fitted today and the noise will be an acquired taste when driving normally, but when on the gas it sounds the business. As for the revo stage two, there is a noticeable improvement, and whilst logging the car we were up to twice the motor way speed impressively quickly. However on the way home the roads were damp and it was hard to get the power down. That said the difference versus stage one isn't the same as 0-1 but its only £60 instead of £600 so i would say its better value overall. Will keep this post updated as i get out in it more