Recently bought my wife a Note 1.5 DCI (2012), mileage 45K. I had a remap done on it to delete dpf and egr. The exhaust is now smokey (black) and has an intermittant fault whereby it sometimes wont rev above 3400 rmp and shakes like its running on 3 cylinders. Other times its fine. It seemes like a blocked exhaust but that seems clear. Unfortunately the garage that did the work is closed due to the lockdown. Any insights appreciated.