Porting Templates from various outlets are available online: https://www.pineappleracing.com/portingtemplatesandequipment.aspx
Intake Ports
The following has been taken from: https://www.fc3spro.com/TECH/PORT/porting.html
Rotary engine porting is the key to making efficient power. There are lots of options available, and the page is dedicated to showing the basic port jobs that most people have.
At left is a typical street port; right is the stock port for comparison.
Typical mild bridge port – bridge is for corner seal riding on rotor
Mild bridge port showing back-cut profile
Serious bridge port, also known as a J-bridge or auxiliary (bridge) port
Stock rotor housing on left; peripheral port rotor housing on right
Prepped side housing for peripheral port engine showing blocked stock intake port
Exhaust Ports
The following information was taken from: http://fc3spro.com/TECH/MODS/ENGINE/INTERNAL/RHOUSING/export.htm
For forced induction rotary motors that include turbocharging, the rule of thumb is not to port the exhaust ports “upwards”; porting upwards increases timing overlap between exhaust and intake. You can take out material on the sides and downward from the original, stock exhaust port. Be warned about going too low on the exhaust port – this also kills torque, and I don’t recommend going too much down for a street/mild powered engine running under 300bhp. Keep in mind to radius all corners of the exhaust port like the original ports to keep transitions of the apex seal moving over the exhaust port smooth.
The stock stainless steel exhaust sleeve usually prevents any extreme exhaust porting; you need to transition the exhaust port walls into the sleeves to keep exhaust flow smooth. Very few shops offer thinner exhaust sleeves for radical exhaust ports. Overly large exhaust ports are not always a good thing for turbo motors, as the larger passages decrease exhaust gas velocity. Higher exhaust gas velocities are wanted to push the turbocharger more efficiently.
Rotary Miata 
