I am thinking of installing a sound system on my roadster FF MKIV, working through my iphone and blue tooth. Any suggestions for placement of speakers. I am thinking of two 6.5 inch speakers side by side between the seats and a couple 4 inch speakers under the door. The amp will be in the trunk and I will mount a blue tooth device in the dash that communicates with the iphone and amp to change volume, advance tracks etc. I am wondering whether the side speakers will actually be able to be heard over the exhaust. Any feedback will be appreciated.