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Works on all 2006, 2007, & 2008 Alpine head units.  Not recommended for DVA-9965 or similar head
units that have speaker connections in a separate wire harness as you'll still have to splice speaker wires.
Check your Alpine HU or manual - if all the wires are on one connector (like below) then it should work fine.
Works on UK cars and head units - thanks to Tom for being the guinea pig and reporting the good news!

Now doesn't this look easy?  Get the PnP harness for $25 and don't splice wires!

This custom-made wiring harness allows you to install your Alpine head unit and DCI with a minimum of effort, in many cases completely eliminating the need to splice wires.  All you do is plug the connectors together and the wiring for power, ground, front and rear speakers, dash controls, power antenna, dimmer, and the mute/ATT function are done.  The only time you would have to do additional wiring is if you elect to use options such as a cell phone interface, external amplifiers, or the SCV feature of the DCI (which is just one wire).
Optional SCV wiring kit (+$3) is required for SCV to operate.

 SCV Wiring Kit ($3)
makes short work of  connecting to the vehicle speed signal.
No crimp tool reqd.

Your Alpine head unit wire harness connector must look like this

in order for the PnP harness to work