in the video they aired the GSXR tires up to 32 front and 30 rear.
my manual for my zx-10r says 36 front and 42 rear?
I understand a slight difference but that seems extreme?
Track pressures are entirely different than road pressures. Why? The tire needs to be at an optimum temperature and pressure while riding. On the road, you will never get the tire up to the same level of stress as the racetrack, unless you are just cruising around the track as a novice for a sightseeing lap.
The stress on the tire from high cornering and braking loads, but mostly from hard acceleration, creates a lot of flex and heat in the tire, far more than road riding can do. Thus we start out with a much lower pressure in the tire, because the stress and flexion creates a much higher buildup of pressure due to the excess heat. This will get the tire up to the recommended temperature and pressure for track use along with providing a lot larger contact patch. We start out with a higher pressure for the front tire because it's subject to a lot less stress than the rear and needs to be bumped up closer to its desired hot pressure from the start. The rear starts off at a lower pressure, but the pressure will rapidly build because of the stresses of acceleration; we get a hotter tire, with a higher track pressure, but the compound is also sufficiently heated to provide the best grip.
One thing about tires these days is the compounds are drastically stickier and longer-lasting than we had 20 or even ten years ago, so we can run the tires at higher pressures on the road, and still get excellent grip, protection from road hazards, and longer tire life. Traction control and ABS add additional levels of safety if you have them.
When it's colder we run lower pressures, sometimes 29 front/26 rear, for example, for Q3s. 32/30 is the standard baseline for most supersport road tires for standard conditions, basically 59 deg F/15 deg C or thereabouts.
Don't run these pressures on the street. If you're lighter, like me (141) you can drop them a bit. I run 34F/40R which is very good for all-round riding and tire longevity. If you want to see if you are in the ballpark, check your pressure and set it right before you ride, and check it again when the tire is hot. Generally you don't want to see much more than a 10 percent increase for road usage.