After installing dp on my 535i, my car starts to bog down/jerks at around 4k rpm, when pushing the gas pedal 3/4th the way down. The jerk feels like a beginner shifting gear in a manual car. When i floor my car, i dont feel the jerk at all only when i press the pedal half way - 3/4th way down.

 

Do a couple 3rd gear adaptation pulls to get the car's DME used to the increased exhaust flow. Also make sure you either turn on the auto delete option on your JB4 or program the map for catless dps on the pro-tuner.

 

Thanks, i solved the issue. It had to do with the tune, i updated jb4 to iso firmware without removing the diodes.

May i ask, what should i get next if i want my car faster?
I got Jb4 + dci and dp. I don't know what to get next to get the most power.

 

E85 and put it in map5 or do a backend flash. You can run a E30 fuel mix with your stock fuel system and get a noticeable bump in power. After that you can get the ER FMIC/charge pipe setup to help with your IAT's.