Fur_Trash

1. Go to profile
2. Keep note of Lifetime cash
3. Open iGameGuardian and search for your lifetime cash (try to get a small amount of results by winning some races and searching again)
4. Change the values to what you want

There are many ways to do this but for this I will be using the milestone rewards

When you go into iGG and go back to the game it will say you lost connection but that's fine, just tap ok and continue

1. Open milestones
2. Search for a milestone that has gold as a reward - I will be using the 540,000 milestone as an example
3. Open iGG and search Milestone requirement;reward amount (540000;10)
4. Search the reward amount in nearby
5. Change requirement to a number under the amount of respect you have
6. Change reward amount to what you want
7. Claim

Bronze + Silver Keys

1.  Go to milestones
2. Find a milestone that has bronze keys as a reward - I will be using the 70,000 milestone as an example
3. Open iGG and search Milestone requirement;reward amount (70000;100)
4. Search the reward amount in nearby
5. Change requirement to a number under the amount of respect you have
6. Change reward amount to what you want
7. Claim

Follow this great guide by Qnzboi102 and change it to gold keys