This has confused me for quite a while. From what I have read in stereo books (home and car), speakers cancel each other out somewhat when they are facing each other. But lately I have seen alot of really nice car installs with the subs facing each other. Im not talking about isobaric loading. Im taking about someone installing one sub on each side of the car facing inward. Kind of like what was done with the 98 M3 (although not to the degree others have done). Does this compromise perfomance? Or do they just do that for looks regardles of the decrese in performance?