They rebuilt my perfectly running engine after one years use due to oil contamination. Charged me several hundred dollars more than quoated. Dynoed the engine and said it was good. I installed the engine in my car and had to fix oil leaks in oil pan and valve covers. Intake manifold was also loose. After 1/2 lap at Daytona the car was blowing smoke everywhere. After inspection the engine partially melted 4 pistons. John from Exprss refused to take responsibility saying it was a tuning issue. I get that but he tuned the engine. Even on their website it’s stated they work and tune Efi engines.