I have a K&N panel in my V6 Coupe and to be honest you don't notice a huge difference and there is no more noise.In all honesty I fitted mine for cost reasons more than anything,£37 for a K&N that is guaranteed for 10 years.
The engine revs a bit freeer,but to be honest even if you get 3 hp gain with one you're not gonna notice it much on a 194 BHP engine anyway,still a worthwhile investment though as my next thin going on will be a powerflow exhaust and a Superchip next year,all 3 together should see an extra 28 BHP which should be more noticeable