2014 E63s

As for pipes, renntech, rado, MBH and others seem identical, so I would go with rado as they are the cheapest. Now that being said, weistec has a "true" downpipe that runs $5k, but seems to be engineered for the most hp gains. Thus far, no one on our forum has run these so, no anecdotal accounts. Also AMS claims to be releasing their take on the down pipe before X-Mas.
I'm waiting until then to make my decision
If you have any questions please feel free to give me a call or go ahead and ask on the forum.
Thanks-
-Craig


