I went with the 57 series, plastic tubing doesn't transmit as much noise as the aluminum one. Plus there is less heat exchange to the intake charge. Its a straight remove and replace deal. The stock airbox is a bit of a bitch to get out. But it goes quite easily from there.
WARNING: Make sure any wiring harnesses in the area are covered in more tape and moved away from the air filter. I didn't do this and it caused my A/C compressor to cycle on intermitently. Shorted out 4 wires in the harness! Be careful and good luck, Bob