You really should not be driving the car period let alone trying to give it any kind of extra throttle on the highway. Get that thing looked at asap or you won't be so lucky with the repair next time.
One thing I've learned with modifying high horsepower cars is it doesn't take much to completely destroy it and one of the BIG ways of doing that is doing mods and not properly tuning for them.
Blowing oil out of the exhaust definitely sounds like big issues to me. If you don't know what to do, I'd say get it to a shop that does and have them look it over and then tune it.
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