Right off the website
Chip Features for Version 5.6 :  
Version 5.6 for 86/87 Buick and 89 TTA (84/85 ECM chips do not have these features)  
-User Adjustable features! - requires a scantool, Chip Version 5.6 Instructions Here (pdf file)   
-User adjustable wide open throttle fuel, +/- 20%, also adjust 1st gear WOT fuel independently +/- 20%  
-User adustable wide open throttle timing, +/-9 degrees, 2 separate settings - 1st/2nd gear and 3rd/4th gear.  
-Open loop idle for smoothness, idle BLM still has learning capability (not locked to 128).  
-For alcohol injection, special timing curves to help reduce "transitional" knock.   
-Variable timing based on mph and airflow, provides extra timing in the low/mid boost area.  
-BLM lock at WOT to improve consistency.  
-Shift light capability through the SES light if requested.  
-False knock ignore capability for launch, turns off when preset mph is reached if requested.  
-Antistall, helps prevent stalling and reversion through the MAF when lifting off throttle after boost, helpful with higher stall converters.  
-MAF/LV8 locks on to 255 under wide open throttle conditions for consistency.  
-MAF "Dropout" ignore  
-No EGR, egr function is disabled :wink: