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18 Stock LM7 5.3L-NA vs HP Performance Single Turbo (8 & 11.3 psi) The stock 5.3L was run with a set of long-tube headers, 36 psi injectors, and FAST XFI/XIM management system. Run in normally aspirated trim, the 5.3L produced 361 hp and 386 lb-ft of torque. Running with the Precision turbo on the single turbo kit from HP Performance resulted in 510 hp and 521 lb-ft of torque at just under 8 psi. Adding an intercooler and increasing the boost pressure to 11.3 psi resulted in a jump to 608 hp and 641 lb-ft of torque. At this point, the stock combination would benefit greatly from a cam swap.