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there should be a few threads for this for the 08s now but here is the run down....oh and having sync or not really does not matter unless you want to install an aftermarket radio

1. remove radio and install line output converter
2. run power wire from battery to amp location
3. find accy power and run your remote wire and rca's from line output converter down the OPPOSITE side of the car from the power wire
4. ground amp
5. hook up subs to amp
6. tune amp
7. reassemble everything
 
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