Jump kit
You will need to obtain the jump kit from Mammago Garage. It costs 15 pearls. If you don't have enough pearls, try revisiting the factory and Black Isle to collect any items you missed. You can also enter two Looters Caverns to obtain two more pearls, and can also purchase a pearl detector at Ming-Tzu.
The protective barriers can be jumped by moving towards them at full speed, and jumping when they are very close.
The Races
While you can complete the races earlier, you must complete at least two by this stage. The races can only be completed in order; to advance to the next race, you need to rank within the top three players.
In general, you will want to constantly use turbo to go through the laps. There are also boost platfloms that will give you an extra speed boost as necessary.
Race 1
The first race is easy; as long as you keep turbo active and follow the track, you can keep turbo active.
There is a small gap before the 180-degree turn, which is the tracks only shortcut.
Race 2
The race is longer, and the other racers are slightly faster.
Race 3
Before you can participate in the third race, you need to purchase the jump kit to reach the slaughter house.
The entrance to the slaughter houses is to the left of the second boost platform.
Race 4
The racers are quite challenging, although you are not required to participate in the race.
There are two branches in the race. The first gives the option of riding in the water or along the dry platform on the outside of the track. This outside platform is longer and provides only limited benefit.
The second branch is in a rocky tunnel, with a small shortcut appearing on the left. The longer path has a laser fence visible.
Slaughterhouse Entrance
Once you enter the secret passage in Race 3, you will need to speed down the broken road. You will have to dodge attacks from a robot that is defending the area.
At one point, the road collapses into the water. However, you can still go up the other side of the fallen road to continue to the slaughterhouse.
You will eventually reach a small area. Reach the end to dive into the outer moat.
To continue into the slaughterhouse, fly under the security drone to cause it to drop a torpedo. Fly into the side tunnel containing the mine to have the torpedo strike it. Repeat this two more times to clear out the other mines. Head to the dock and climb up. The DomZ creatures will attack once again, but they are not much of a threat.
When the enemies are dispatched, walk between the gap of the two doors and push them open. Return to the hovercraft to jump up and into the slaughterhouse.
The first corridor within the slaughterhouse has a few laser drones. Avoid the beams either by waiting or hiding behind boxes. You should then reach a room containing fans. Head to the end of the water floor, and up the ramp. Cross the upper floor to the other watery area, and onto to water platform. The next exit is the door at the end.
In the next room, you need to detonate two mines by ramming metal boxes into them. You can also return to the races in the same room, by the isolated doorway; this allows you to take a shortcut to and from the slaughterhouses in the future.
You will now enter the main area of the slaugherhouse. Park on the dock, and fire a gyrodisk at the switch in the control room above. Enter the hoverboat and go under the grate; it will close behind you, and you can only reopen the grate once you complete the section.
Slaughterhouse
The first area in the slaughter house is just before the first gate. To continue, dock in front of the gate, and climb up. Destroy the flying opponent. Raise the gate by shooting the switch next to the gear, and quickly running to the hoverboat. Enter, and redock it on the other side of the gate.