i just installed the IceLink on my '05 4.4i w/ Nav and NO dsp. The install was very simple. the sound quality is excellent. I was impatient (bad habit) so I bought the kit from best buy and installed it myself. The installer at best buy wanted to charge me 50 bucks and said it'll take about 3-4 hours to install it. Yeaaaaaaa right, I installed it in 45 mins. IceLink is the way to go.....