1. I have the Monsoon system and the aftermarket system works great with it... No mods needed there.
2. OnStar needs an interface for it to work correctly... That and the door chimes. If you have an installer do this for you, they will know about this. If you do it yourself... Just search the archives here. There is a lot of good info from other people's experience!
Good Luck and keep us posted on how it goes!
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2006 H3 - Luxury - Superior Blue - Sunroof - Chrome Pkg. - Chrome Step Tubes - AVN30D with rear view camera and iPod connection - Volant CAI - MagnaFlow dual exhaust - Throttle Body Spacer - Train Air Horn (to be installed) - More adds to come (New shoes & supercharger!)
1990 Porsche C2 (911) - Highly modified and very, very fast!
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