Assertion: engine's output | /r/HasProperty | with optional performance exhaust
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text: The additional output, which jumps from 455/460 hp and 460/465 lb-ft in the LT1 to 490/495 hp and 465/470 lb-ft in the LT2 (the higher figures are with the optional performance exhaust, which adds a second set of flapper valves) is due to the better breathing achieved with the engine in its new position behind the passenger cabin along with the other small tweaks mentioned above.