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That's high. Our stock LS1 with Vortex CAI was only 293 RWHP.
After Corsa install and tuning, it made 328rwhp and 352rwtq. Car came with a MAF that was messed up, it was reading IAT's in the 140's while idling, so who knows what that was doing. Fuel trims where were +13.3 and +11.9 on the baseline pull.