So just ordered my Stillen SC

Z&I

Hey Mikey !!!

Check your Dyno Graph ... and look for where the Torque Curve starts to dip ... That's your shift point.
You still may show HP increasing but you will be losing the rate of acceleration.

Do some testing, and you can fine tune the shift point to your liking as needed.

If you did the pull thru the gears you may notice a different shift point for different gears...good to know if you plan to race.

I ended up installing an Auto Meter Shift Light (guage style) using an 'A Pillar Guage Pod' crafted by 'Gale Force' - one of the members here.
This shift light allows you to program each shift, and being located in the guage pod, it is much easier to see than the OEM one ...

My dyno graph indicated to shift between 6900 and 7000 (with some other performance upgrades) and that worked for me.

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BB