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The first few pulls were showing excellent gains even though no custom tuning software was used. Fuel was bumped up but there were no changes to timing. With a peak gain of 54 rwhp and 23 lb-ft of torque, the owner was very pleased with his new numbers. Notice where originally the torque drops off after 5,000 rpm, but with the new cam and exhaust it holds strong all the way to redline. Even more impressive are the average gain improvements with the 6.1L averaging 348 rwhp and 387 ft-lb across the full rpm spectrum. Imagine what a custom tune could unleash!