It is extremely easy to install the HKS in recirc, I did it last Tuesday night. Keep in mind the only install I have ever done before the BOV was the CPE CAI, and it was still a sinch for a noob like me. Also to replace the factory BOV, it is easy as well...there are 2 screws holding it in place, and than you have to remove the extension from the vacuum line, attach the vacuum line, and re-attach the recirc. hose to the factory bov...Very easy, Im going to be switching mine up everytime I go into the dealership, will probably take 15-20 minutes each time.