multiply 6.5 by 25.4 and you will have your answer. 25.4 mm in an inch so youll convert from standard to metric
__________________
Early 04 SRW 3500, HO Auto 4x4
-Amsoil Intake w/ Gutted Torque Tube, Boost Elbow, Isspro Gauges, Smarty S-06, 4" Turbo Back, Donaldson Muffler