I know this post is a little older but i as well seeing the blueish smoke from the tail pipes after my exhaust upgrade. When i noticed it was after i changed to my lower temp thermostat and holding the revs at 2.5k to help with bubbles in the system.
After about 15sec of holding the rpms at this range did i see smoke from the exhaust and smell of oil.

I have an appointment at the dealership for them to check the pcv and rear turbo for a bad seal. Car only has 6k on it.

Current mods: Livernois Level 4 package with highflow DPs. 2015 SHO

Welcome aboard the EBPF,Are those catted or non catted DP ?  Z

They are High flow cats from livernois

Good luck because I think your going to need it. 

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More likely to see oil fumes from the exhaust if your highflow cats (regardless of brand) do not have catalytic converters.  There's some oil burnt even in the OEM setup, but you have 3 cats to deal with it, so you don't normally see much if anything.  In addition, there's the debate about insufficient backpressure with catless downpipes causing turbo seals to blow out.  That's why it's important to be sure which type you have on the car now.

Also check the intake piping and intercooler for pooling oil/crud.  Not a given problem on the SHO, seems a lot of them stay "dry", but some don't.

I will check the piping and have read others with the same experience. I only see it if i hold revs at 2.5k-3k for 15 seconds or longer in park. Taking to dealer tomorrow to have them double check everything. Thanks for the input!!!!!!! Much appreciated.