Not Ranked
I do not know what RPM your peaked HP . I imagine the basically stock 428 may not want much more than low/mid 5's. However, if it held strong to 53-5500 or if you got near the higher 5's before peaking you may benefit from a Perf RPM intake. The Perf drops off at rated 5500...I usually subtract a few from their advertized ratings. Overall...you're making some pretty good torque !
I bet you make really good tq at 2000-2300 rpm.....that is a big motor afterall.......perhaps it's a matter of adjusting one's perspective ? It won't take very much [pedal to get that big boy rolling hard !
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