San Diego G35 Club GTG
I forgot to mention with HFCs, Berk will more than likely not pass CA smog, while Kinetix claims full compliance. I just don't particularly like the construction of the Kinetix.
Berk, look's like they take better quality pics but that's about it.
Kinetix
i have Kinetix and passed SMOG w/them. the construction is great, only difference VS Berk's is Berk's use the OEM mounting brackets. Kinetix don't, so you can save some weight remove the brackets under your car. i haven't seen one bad review of for Kinetix HFC's but i've seen a few bad reviews on the Berks. i'm sure Berks are nice though prob isolated incidents.
BBK