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Discussion Starter · #1 ·
Right now my 00' 5.3 Sierra is completely stock. I am thinking of adding a CIA, Cat Back, electric fan, and a custom 93 octane performance tune.

If the stock setup yields 285 HP and 325 lb-ft at the flywheel, what could I expect at the flywheel with these mods?

Does 325 HP and 375 lb-ft at the flywheel sound realistic with this combo?

Thanks in advance,
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