Intermittent Smoke on Deceleration - 2015 M6

[CKB M6 GC]

I know there are a few threads about thisbut none recent or none have a resolution. Here's the deal:

2015 M6 with 19k miles
Catless DPs (recent), Stage 2 Tune, BMR Intakes, Megan Racing Axleback

Car will randomly smoke rolling up to a stop
It is a whitish smoke and smells dirtier than normal offroad exhaust odor
No smoke on cold start
No smoke after warming up car (15min drive) then idling (10 min) then rev
-this is the test many use for valve seals

My assumption is turbo seals but seems so odd at this mileage.

Any other tests to ensure it is turbo seals? I was told smoke on decel was turbo seals but see other turbo seals smoke all the time. And some say intermittent smoke signifies valve seals.

Anyone else had similar issue and a resolution?

[15Geez]

Interested in hearing feedback from others as well. Since you recently installed the Catless DPs, did you experience the smoke with the stock DPs?

I've been considering the megan exhaust as well. How do you like the sound? Any clips of your set up?

I noticed in the following video the car seems to push out smoke after going catless but not beforehand. If this is what you're experiencing you may want to consider doing a 200 cell high-flow cat.

[arucano]

The "smoke" is water vapor not oil burning. Steve Dinan has stated that in test they carrier out, the cat was not a power limiting device under about 700HP. According to him, the turbo chargers have higher limiting restrictions. Have a look at https://carbahn.com/media/. He deals in facts and has a proven track record (pun intended)

[PARANOlD]

Probably vapor