i did a search on this a couple of months ago and found most guys in here to be using redline.
i did some reading and research on my own as well, looking @ neutral websites and see what they have to say abt redline and its was always positive.
i went ahead with it and no regrets whatsoever
expensive but well worth it. its gunna stay in your diff for 2 years so might as well get something top of the line.