$500 was for two cats, installed, with tax and cat disposal charge. Mine very well could have been magna flows too. To cut them in and weld them professionally isn't cheap if you want a high level of confidence in the work.
YMMV
~6 speed~ Rear Fogs ~ Shadowline ~ Tow Package ~ OEMMM///S38B38
Originally Posted by 530iTouring
A local shop advertises Magnaflow catalytics for $120 welded in. I am visiting them when I have spring break.