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Here is Hank Denieki, SLP's chief engineer, using the handheld tuner to raise the shift points on Eddie's SRT8 before we made any passes down the quarter-mile. Our best e.t. came from firmer-up shifts at 6,400 rpm for the 6.1 and 6,000 rpm for the 5.7 Daytona. The handheld tuners are tailored to SLP's performance parts upgrades and their PerformancePacs.