2013 JCW

I recently installed a cat less downpipe (two weeks ago) and have yet to get the final tune out on the car (will be this upcoming Monday). My concern slightly is, sine the downpipe install I smell oil, like burning oil. What I will say, is as the time has progressed the smell has died down so so much more then when I originally had this, it is extremely noticeable if I drive the car a little hard. I didn’t notice this before with the stock downpipe. I check my oil level every time I drive since I have done this, I have had zero movement on the oil level. Exactly where it’s supposed to be. I understand when installing new exhaust parts they are gonna stink for a while, but how long does that usually last? Should I start looking for something I’m not noticing?!