Best prices I've seen on the Magnaflow 16869 are around $500,
Last time I checked that was about half the price of the Borla kit.
...and the Magnaflow has Larger 5" tips
I've got the Magnaflow CatBack, and it gets Top marks from me
for Quality, Looks, Sound and Performance ...sorry I dont know of anyone with a Borla on a 4G Ram
Lot's of Magnaflow info in this thread : http://www.ramforumz.com/showthread.php?t=84922