So ever since I've installed my catless dp I've noticed that I have more than normall exahust smoke coming out. Its not thick white smoke and does not linger, it seems to disapte rather quickly. It doesn't smell like burnt oil just normall exhaust smell maybe fuel if anything. I checked my oil level and was 1/4 qt low 1500 miles into my oil change. I do know that wrx's and sti's do burn oil. So my question is, is this some what normall or may I have a problem, there has been no power loss and I'm using mobil 1 530 aprox miles is 4500 and its also winter time meaning temps are in the 30's so I'm hoping its just the cold weather and not a major issue. I notice it on cold starts and after driving a while sitting at idle though it does go down and is minor. Any thoughts would be healpfull to calm my nerves.