well. ive just done this,
i had a wierd buffering feeling under 1.5k in higher gears when literly cruising at say 30/40 mph.
but i wanted to give the car a major reset as i am a new owner and going by the fact it has a stupid cone filter and half arsed exhaust im guessing the owner liked to give it some beans some times, i mean dont get me wrong i dont mind some foot down action entering 70mph zones, but the car isnt going to set any land speed records.
i know ive come from a 1.8t heavy audi a4 to this for fuel economy reasons so i knew it wouldnt be "fast" per se, im actually suprised on its get up and go once it gets going.
but it did feel a little down on the 145bhp promised!
still done as described
fel perkier, smoother at slower speeds pulling away, and i think the buffering has gone away!
either way it can't hurt i suppose,
well worth the two hours, even if you pass the time cleaning the car!
thanks to op