Hello,
I replaced the original filter with K&N panel filter on my 2006 tdci 130. I can guarantee you will feel the difference. The sound of the engine will be better, the acceleration will be smoother and stronger through all the rev range. I tested it on the rolling road after the change (not before unfortunately), it was 140 BHP but I am not sure how many came from the filter. Altough it increases a little bit the consumption especially in town I recommend the K&N panel filter to everybody.
Happy new year