They're scattered among many different threads within the 1 series forum. Here are some I've been able to quickly find:
http://www.1addicts.com/forums/showthread.php?t=1251909
http://www.1addicts.com/forums/showt...t=SIB+12-15-14
http://www.1addicts.com/forums/showt...t=SIB+12-15-14
http://www.1addicts.com/forums/showt...t=SIB+12-15-14
And the thread on when Dinan was having that half off sale for the S2 tune and a few of us chiming in about trying the tune to see if it helps with our DCT problems:
http://www.1addicts.com/forums/showthread.php?t=1348167
If you do a search for the SIB 12-15-14 and DCT lag, you'll find plenty of hits.