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I have a signature 600 cm570. Had 3 leaky injectors so I replaced them with 3 cummins remans. Ran great for a week. Now I'm getting a really strong exhaust smell. Fuel mileage went down. And am seeing a little bit of smoke when I shine a light at my exhaust when it's dark out. Don't see any smoke in the day time.. faulty injectors maybe?

Bubble test them.

https://youtu.be/Wu_WN8BA-LA?si=3DuQnG0zQFjjcIk1

My Cm570 was smoky at takeoff and acceleration at high boost
Replaced Turbo with a YT Turbo Griffin, Georgia. All smoke gone.