I have for sale a brand new set of Powersprint SS dual exhaust tips for the X5 E70. They will fit a 4.8 and 3.0 from years 07 to 10. I paid $500 I'm selling them for them. $350 plus shipping. This is a perfect set up if you want that dual exhaust look and keep the OEM muffler.
This company is out of Germany. They make exhaust systems. Not to get confused with Supersprint.
Specs are
Stainless steel polished, 2x 76 mm per tailpipe
160x76 mm overall measures per tailpipe
Set left/right.
The original tailpipe has to be shortened adequately
Also comes with mounting brackets