Ignorance is bliss my friend.
Smoking turbos = is a single factor analysis.
Not a single person with minor engine mods has a smoking turbo. Your theory of the engine running richer or adjusting it's fuel trims because of the intake, causing more oil to spew into the exhaust is hardly realistic and has no grounds of proof.
I've got the rest of the forum as proof. It's an obvious assumption given that almost EVERY time you install some form of exhaust modification to our cars, they will indeed smoke.
Don't believe me? Scroll through this thread:
http://www.mazdas247.com/forum/showthread.php?t=123691179
Not true. My early '07 has only a K&N air filter and a motor mount insert. Bone stock in all other respects. My car smokes at idle as well, but they're replacing the engine due to low compression on #3 cylinder. Whether that fixes the smoke probly remains to be seen. I thought for sure it would be the turbo, and maybe it still is, but they were told by Japan to do the compression check. I'm unsure if they went as far as removing the intercooler, i.e. I don't know what tests were done in what order. But basically, when a problem is found, they go no further until that problem is fixed.