Just got my SCT X4 programmer.
2003 EX XL 4.0 All stock except tires and lift.
I turned off the rear O2 sensors.
(1st) What do I set the speedo cal at? It asks for tire rotations.
Stock gear 3:73
Stock Tire 235/70 R16
Current Tire 285/75 R16
(2) any recommended changes I need...