Its been a month driving with the k&n air filter and thought I would share my thoughts with you all.
There is a slight growl from the filter but only noticeable with the window down and towards the end of the rev gauge.
The turbo certainly seems to spool up to maximum boost alot quicker and the throttle certainly feels more responsive.
No gains in mpg but not that fussed about that.
Overall im happy with filter.
Im looking at blanking of the top box behind the head light and putting in a bigger opening in the air box to run a bigger cold air feed pipe.