Like the title says, Stage 1+ (93 Octane) Unitronic tune. Some background: The car has 36,000 miles and has been running 93 octane for months now even though the tune is new. However, when I'm taking the on ramp to the interstate and I'm WOT in third gear, the engine cuts off around 5500rpm. It's not the clutch slipping. It's just like the engine bogs down and loses power and the RPMs briefly drop. No codes or CELs thrown. Only other "mods" are the intake snow grate removal, K&N oiled filter, and a CTS turbo inlet pipe.