New member from Michigan

[effingbrian]

Hello, new guy hear from SE MI. I drive a 2008 Ponitac G8 and am looking for a decent, no hassle installation subwoofer. The Bazooka seems to be a good choice. I do have a couple of questions. Maybe some one can help me with?

Can the BTA6100 be mounted inverted to the bottom of the rear shelf found in most sedans?
I don't want to take up floor space in the trunk with a subwoofer.

I have the base stock four channel stereo. I've replaced the stock speakers with Polk Audio DB6501s in the front and DB651s in the back doors. The DBs are 4 ohm. If I install a BTA6100 which is 2 ohms per channel what is this going to do to my impedance matching for the rest of the system? I am thinking I will reduce my impedance for the rear doors, which is where I was going to get the signal for the BTA6100, to something less than 2 ohms. Will this give me an imbalanced sound stage?

Sorry for the long winded post, but I want to make sure I am doing the right thing.

Thanks for any and all help!
Brian