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Mine drove great (my 2001 X5 was fun, had a tune pushing it to around 325hp, but this was definitely an upgrade) right up until this day. I did notice the heavy sooting on the way exhaust tips when I first bought (it was only on the outers, very obvious in pics, only to discover both diverter valves were missing vacuum lines for M mode), so after driving it the way I drive for a while, all the tips were sooty. I also noticed that I've have peppering all over the back (mines Alpine White), and while it started perfectly, it has the worst sounding cold morning idle...forget moving it during that idle as well because it'd lurch until the idle went back to normal. I'd read that the crappy cold idle and ticking like a diesel was normal, but now that I'm proceeding with their replacement, I'm curious how things will be afterwards.
As for checking their index numbers, you can actually see them from both sides if you look...the ones nearest the firewall are the easiest due to angle.
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