Yeah. It was several years ago now, but I got mine in a group buy on another forum from Crossover too. W/Shipping it was still $640, as I recall.

As for it fitting the 5 series, I would not assume, but I thought the 5 was the same everything as a 3S only re-bodied and obviously taller.

And for anyone else interested, there is nearly a 2" difference (1.68" IIRC) between the 3 sedan and HB... the sedan being longer in the body.
Put a HB exhaust on your sedan and you will be smelling burnt bumper plastic.

 

Just got the vibrant for my 2006 hatch and I started to take the stock exhaust off when I noticed a 2nd O2 sensor after the cat. I'm assuming I'll get a CEL once I put the vibrant on because there is no spot for this sensor. Is there a workaround to this? Thanks

 

Hmmm. Y'know I didn't have that problem w/my '04? Do you live in a EPEZ II state?
In your case you will have to have a bung welded into the system in order for it to work w/o a CEL. Be sure to measure carefully (or have an experienced professional do it) to get it in the correct location.That's critical.
And you might take the opportunity to have an anti-fouler installed at the time as well. This will keep the O2 sensor away of the exhaust stream more and keep it from getting carboned up as fast. In other words, increasing its life. Those downstream sensor are heated and expensive little buggers... +/- $280.
The guys running headers usually have to do this procedure for the upstream sensor since most AM headers do not come w/a bung pre-installed.