I agree changing your tires or lowering your gear ratio would help your et but it would also lower your mph not raise it. As I see it I think it must be a misprint or an error on the timing. 12.98 is possible but 113 mph in stock trim seems way to high. It takes an approximate 10 hp to gain 1 mph or lose 1 tenth so 5 mph is a bit much thats like 50 hp.