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I see you have HP and torque at the rear wheels on your sign line and it is a KC engine. If car was tweaked on the dyno it may already be at the best performance RPM. Many things influence how much and when the secondaries enter the picture so you may want to go slow here. Tweaking on the dyno is the ticket so you can see if you are gaining or loosing ground by opening them sooner.
If you feel this RPM has changed it may be from a vac leak or tune up state/ condition. Take some good checks for a baseline before making changes.
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