So I have a sunsation 288 with a 525efi and silent choice. I only use silent now pulling in and out of the marina and at idle. Planning on heading to a lake in the fall with a decibel limit. any opinions on a maximum rpm I could run at with the silent choice on? I have the original manual but it doesn't specify. Really looking to cruise around at maybe 3500-3800 max.
Any opinions on if this would be an issue?

Run whatever RPM you want. Keep in mind that many engines are 'thru-the-prop' and run WOT that way. You simply have a "choice" to run thru-hull or thru prop.