I had them install it opposite the onstar antenna on the right front cab. This may be reaching a bit but right before the problems started I got a hairline crack across the top of the windshield. Actually got it on the way to the stereo shop. I cant imagine what this could affect although this vehicles complexity has always amazed me. They did not remove the dash or head unit to do the install. I really appreciate your response. I was reading your xm install and wished I had not already bought the commander.
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2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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