One of the most requested improvements in is enhanced support for General Motors’ Gen 5 LT engines, specifically the 2023-2024 model year trucks and performance vehicles. Users have reported access to previously locked-out fuel system tables, allowing for safe tuning of high-pressure fuel pumps on L84 and L87 engines.
The "brain" of the operation. This is where you modify spark, fuel, and transmission shift points. hp tuners 4.12.4