after getting my vtis a few weeks ago i've quickly sourced most of the mechanical problems which are in the process of getting fixed but after doing an a full oil change and replacing the oil filter i've noticed a big difference in performance only thing is the gearbox doesn't crunch when driving normally but when going full pelt i've cot a crunch in nearly every gear. Is this signs of the gearbox oil needing replaced or is the box on its way out 1"£££$££"