Over the weekend I installed my Redstar catted DP (2019 GLA 45 with 7k miles). The hardest part was wrangling the fan out. After about an hour I got it free. I was also able to remove the factory DP from the bottom, without removing the mid pipe. There was enough flex to get it free. The installation was super easy because the cat is so much smaller than OEM. Even with heat wrap on the first 8 inches next to the turbo. I opted for the Gesi cat. No CEL's at start up. I have the OE stage 1 tune installed. I feel the difference mostly in the mid range acceleration. It's a really nice piece.