On my e34 535 I have an Eisenmann exhaust and it is amazing, but its a simple design so if you are looking for anything other than large polished stainless straight tips, then I would look elsewhere. But its performance and deep throaty sound are to die for, I absolutely love it. I was lucky enough to buy mine from my mechanic that had an extra that he wanted to get rid of for $350 which was a steal!.....An eisenmann exahaust costs roughly $1200 for your car .... maybe look around and you might find it cheaper but here is a start... Good luck... http://www.beastpower.com/Merchant2/...Code=bmw-5-e34
I have had supersprint exhausts as well, which are a bit pricey, but are worth it