I have read a lot of other posts and have not come to an answer yet. This is my situation, may be a little different.

Setup:
120k miles, 00' AP1, Berk high flow cats, HKS exhaust (dual exit) and cold air intake
I get white smoke coming out of my exhaust tips when the car is at higher RPMs. When I am cruising and not flooring it, keeping it low, there is no white smoke coming out. I have had a few people tell me when I am pushing it at high RPMs, white smoke is coming out and when I sit idle and rev it up high.
Coolant and oil seem fine

Thank guys!

 

Maybe coolant leak in head gasket. Run a head gasket coolant pressure test. Good luck!

 

Gasket leaks are very rare unless you have overheated the engine, or it is running boost.
I've said it before that whitish smoke when running HFC's or test pipes can occur as it is a mix of moisture, fuel, and oil. Mine has done that before, after switching to the OEM cat it did not happen again as OEM cats are three-way catalysts that convert hydrocarbons, HFC's are not three way. Seen it on a few S2000's that did not have coolant leaks,including mine. If you have a coolant leak on a car it is very evident and you will smell it.