I have infinity kappas 62.11i in the fairing and pioneer ts-d6902r facing the rear wheel in my bag's. ...just one in each bag.... I have SS PN4 520 pushing them with a SS head unit 2v....and I was thinking about putting some 6.5 in the lower fairing...what would be a good speaker to use that I could run off the head unit? Everything is running off the amp as of now....no speakers are hooked up to the head unit

 

I don't think you'll be able to hear em if you hook em up straight off the stereo because the others are being pushed by an amp and will drown the new 6.5s out. Best bet is to get another amp for your rears that you have (a 2 channel would be good) and use the 4 channel you have to push the current kappas and the new 6.5s. As far as which 6.5s to get? You already know my answer...62.11i