kakanokumees

Hello, I have had a stage 1 c400 for about 2 years now without any problems. About 3 months ago I wanted to get some more sound out of my car and decided to get cats and opf removed. From 1.6k 2.5k rpm with about 5% gas the car stutters just a little bit and at highway speeds the fuel consumption jumps up and down from 7L/100 to11L/100 every half a second. My tuner is not a slouch and has never had this kind of problem before. He says it is something to do with the opf and can see the problem but has no idea yet on how to fix it.
Has anyone here done an opf delete before on those cars before and could give us some directions?
I added a picture of the dyno graph just for reference to show how well he did on tuning it
Best regards
Hans

White One

Help me out a bit..What is an OPF?

kakanokumees

otto particulate filter, also known as gpf. An extra thing that is added to newer gasoline cars to burn bad stuff.

W205C43PFL

Didn't know there was an OPF on a MY18 car, I thought they introduced it on European market cars for MY19 facelift... or wait... is your MY18 a facelift? If so that might explain it because from my understanding EU gets newer cars (in this case facelift) half a year early which sometimes results in one model year earlier.