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Dragon, I assumed the pads have to "travel" 1mm to re-engage the rotor. Therefore your pedal travel "increase" would be the volume difference between 1mm travel of a 36mm piston vs. 1mm travel of a 40mm piston.
36mm: area=Pi*r^2=3.1415*18^2=1018mm volume=1018*1mm travel=1018mm^3
40mm: area=Pi*r^2=3.1415*20^2=1257mm volume=1257*1mm travel=1257mm^3
volume increase for two calipers = 2*(1257-1018)= 477mm^3
In a Viper, the master cylinder diameter is 27mm.
27mm: area=Pi*r^2=3.1415*13.5^2= 573mm^2
travel distance to make up a volume of 477mm^3 = 477/573 = 0.83mm
In a Viper, the ratio of the master cylinder movement to pedal movement is about 3.5:1
pedal movement= 3.5mm*0.83 = 2.9mm, or about 0.11 inches
Again, this is based on a 1mm travel distance between no braking and braking. Whatever it is, in a Viper the pedal travel difference is not noticeable. If your master cylinder diameter is close to 27mm, I expect the same. Many Viper owners take this single piston rear caliper off and replace it with a four piston caliper and stay with the same master cylinder. I think it is because we look at the diameter change but overestimate the piston travel.
If the rear brakes help you, then going to larger front brakes may undo that benefit. The car handling is based on the front to rear balance, rather than the total clamping force. Unless you are overheating the front pads, do you need bigger ones?
I will put together a few shipping/cost choices for you and send a PM.
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