AGU = 150 BHP KO3 Turbo maps to 190BHP, 98-99 cars
AUM= 150 BHP KO3s turbo maps to 210BHP 2000-02
AUQ= 180 BHP KO3s turbo maps to 210BHP 02 onward
The years are a rough estimate you get some later cars with AGU and some earlier cars with AUM etc...
Both AUM and AUQ are very similar just a different factory map but you get the 312mm brakes up front.
No mk4's came with a KO4.
Lots more info in the mk4 section, especially the maintenance part
