Yes, Dan is right that a 36x on pressure will go 100 MPH. However, on suction, with the insert installed, maybe 85 MPH. And that's on a combat model that is designed for speed, maybe 350 square inches.
Just last week, a member of our club brought a larger plane, a Sig Banshee, with a stock 36x on suction. Took us a few minutes to get the tank sorted out, unrelated to it being a 36x, but then it ran great. No where near 100 MPH for the 510 square inch stunter.