The CPL one is a very clever piece of kit. Guy from CPL has put alot of effort in designing the system. Its is fairly straight forward to fit and requires very minimal mechanical know how.
Performance is awesome and you can feel the difference in performance, the sound it makes is pure bliss just what you expect from an open cone. The filter is located just behind the front bumper underneath the headlight so it wont suffer from any heatsoak etc.......I ran the filter with the Group N cal on my flash pro and it felt alright no FLATSPOTS part/full throttle.
The filter is ok for Hydrolock as I have driven the car when its pissing down. Just make sure you don't drive into no mini lakes!
Overall those who are thinking of buying one, buy one you wont regret it. How does it compare to others? My opinion INJEN = to tricky to fit but better piping. GRUPPE M = no comment!!