I installed my friends system which includes a Sundown Nightshade 12" and an audioque 1200 in a kia sportage.
My camera doesnt really pick up flex too well. Videos dont do any justice for this, this car is loud!
http://www.youtube.com/watch?v=OaXoGOH8wC8
http://www.youtube.com/watch?v=DvnAjsPonGo