I installed the infinity kappas 627.i in the front doors of my camaro last year.When I was done I was getting the popping noise.I went ahead n installed the infinity filter on the passenger side n that made that side sound normal. I do have a pioneer 5900ib deck which is crap by the way. Should i install the other filter for drivers side or take the filter out of the passenger n get a new amp.I do plan on getting all new int speaker n possibly new amp.Which way should i go w/ the rears.I was thinkin Infinity Kappa 652.9i but not sure if they fit for the back seat.And maybe JL Audio C2400.I have no idea how the sound would balance out.What kind of amp should I look at 4channel,6channel.