10. After cooling off from the break-in, the engine was checked over for leaks. Once everything was good-to-go, Ernie began manipulating the EFI Live tuning software and the first post-break-in pull was made. To keep things on the safe side, the engine was steadily revved higher and higher until about 4,500 rpm. Ernie again tweaked the program and our LSX was making 637 lb-ft and 524 hp at 4,316 rpm with 8.9 psi of boost filling the combustion chambers.