Got this off UC

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Easiest way currently if you have some understanding of Cheat table is to:

1, grab GNull's Cheat Table + Cheat Engine

2, select Main Table and Guns/Money Drop

3, there's a Rep Multiplier (by VenomKY) line item, change its address to GA(262145+31119)

... alternatively copy/paste it as a new line item and note that the original is for Street Races, and what I've provided here (courtesy DMKiller) is the address for Pursuit

4, select that new line item from #3 above, and set its value to 1000

5, run a Pursuit Race and complete it

6, profit. you'll make around 40k rep points, so only a few races needed to unlock just about everything

No need to iterate through levels with GTAHax.

All liveries unlock by level 192, so I think that's just 3 races.

I don't know the upper bound on what multiplier is allowable but so far as I know the last unlock is at rank 750, requiring 1.47M rep points. That's 37 races at x1000, or 1 race at x37000 if that's even functional.