Apart from the Berk Technology and Maddad midpipes, there is also that third cat in the bag: the BMW N55 midpipe.
Don't rule that one out
a priori. No shipping queries or transportation costs, because available at your BMW dealer for (normally)
sub $400.
Soundwise it is the most
"domesticated" animal of the three, that much is true, though with the right growl & roar if need be (especially when combined with a decent aftermarket axle back exhaust).
See:
http://www.1addicts.com/forums/showp...0&postcount=27 (N55 midpipe)
http://www.1addicts.com/forums/showthread.php?t=797160 (N55 midpipe DIY installation process)