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Eisenmann, I think, has the best exhaust of all the choices, but the image and sound is a very personal choice. My Eisenmann on my 30i required additional hangers and a right side heat shield (all factory BMW parts) for a clean install, with the only critical work being the cutout on the right side, but using the left side opening as a template, and the rear reflectors as locating points, it was an easy install, and sounds better than the clips on the Eisenmann web site. I think it also improved top end performance, but that is a "seat of my pants" determination, but would go this route again.
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