Well I ordered the Rockford Fosgate sub upgrade for stock Nav systems from my dealer and I am gonna be the guinea pig. He cut me a small deal as long as I let him check it out and give him my opinion on whether he should sell these.
I don't think anyone else on here (or anywhere I have looked) has done this yet as it just came out from SMA.
I will post again when I get it and give it the full testing!
