In my opinion, this is likely what caused that. I'd take it back to your mechanic and have him revert this and then re-torque when the car is on the ground. Then after ~100 miles get a proper alignmen. Best of luck, mate.
2007 GT PRHT 6MT
Tein S-tech springs, oem bilstein shocks, roadstersport race single, Racing beat race mid-pipe w/o pre-silencer, nrg short hub and quick release, dg motorsports lip, Exedy stage 1 racing clutch, Fidanza flywheel, aem cold air intake