|Complete 'Collect money for Krew'.|
A short-burst racing mission through the Port and Industrial Section. You'll have to use zoomers (preferably a single-seated or two-seated zoomer) to get around and pick up the moneybags, although switching often is recommended since the alarm system goes off automatically. There's a 30-second timer for each moneybag (with a few tricky exceptions) and have to be collected in a specific order, with each bag being marked on the minimap as well as easily visible due to a light beam.
Since all the bags are in the lower zoomer zone and with the Krimzon Guard already on your tail, don't bother with flying higher level. The most annoying threat is being downed by a KG patrol bike which costs valuable time. Also make sure to slow down when going for a moneybag since the next one often requires a sharp turn.
The only really tricky bag is the eight one; after collecting the ninth (right before the Slums), you'll need to make a U-turn immediately! The next bag will be right behind you but there's a 10-second timer making this the only difficult one. Once you complete the mission, head back to Krew for a new weapon upgrade.