The metra kit works well and very affordable. The oem part is like $200. Honestly, I would go for the one with nav if that's what you really want. Everything is integrated and the screen position is much better for the nav. Aftermarket decks can be had that outperform the oem's, but the factory stuff just looks cleaner IMO. Just as the car designer intended. Sorry I couldnt be more help.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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