3.5" Downpipes and 3.5" Single Exhaust (SHO)

[NITSOOB]

It sorta lingers after a few small revs at idle..Im used to it when warming up in the mornings, but never see it during the day. It does appear to be condensation, but a bit too much. Might be eating up coolant

Im only at 60k miles.

I did remove the y-pipe merge choke today, with a 3.5" oval section. Maybe the compression in the exhaust masked it? ugh..feeling paranoid.

[NITSOOB]

http://www.ecoboostperformanceforum.com/index.php/topic,3292.45.html
http://www.ecoboostperformanceforum.com/index.php/topic,339.30.html

Seems like its happened before to those with catless DP, but no resolution as of yet unless you go catted. Though the exact problem hasnt been narrowed down.

[SHOdded]

It is rare that it is a coolant problem, in the SHO at that mileage anyway.  The cats treat the exhaust stream, and unavoidably, mask what is going on in the engine.  Most commonly it is a puff of blue rather than white smoke,, but the issue, some say, is a question of sufficient backpressure to maintain turbo seal integrity.  IDK.  Do you have access to a shop that can check the backpressures for you?  May want to check the piping at the turbos periodically as preventive maintenance. 

[ZSHO]

Auto-Car-wash lately? Z

[NITSOOB]

Apparently it happens to many vehicles after a downpipe install after a quick google search. But found this interesting..

There are various band aids like raising the idle which gives just enough relief in the system to allow oil to drain but eventually it will start to smoke again. I tried all kinds of "fixes" on my car and found the best hands down fix is a UPR Dual Valve Catch can and gutting the PCV valve. You need to gut the PCV and let the UPR DV setup take over the all the PCV duties for it to work properly. On my car not only did this 100% solve all the burning oil, smell, and carbon buildup all over the back of the car but I also have not had any more problems with heat melting the reflector and causing it to peel off the car and I noticed the paint is not yellowing around the exhaust either. Leads me to believe the recall for the excessive under body temps is because of the constant oil burning. Anyway I am curious to get my hands on the revised oil separator from ford and give it shot just to see what they changed and see if there is less oil in the catch can. At this point I drain about 1/4 cup of oil every 1000 miles. Hope this helps!

https://www.svtperformance.com/forums/threads/aftermarket-downpipes-causing-smoke.1100422/

I recall reading someone advocating for this, but didnt have success with it. Or maybe didnt have the right catch can set up