folks when selecting first gear its extremly chuggy about half way taking the clutch out. Its been fine lately and all of a sudden its all jumpy ive let other people drive to see if its just me and it isnt. The thing is ive put an after market diverter valve/dump valve and an K&N 57i on, will reno say that the warrenty is now invalid on the gearbox if it needs replaced as the gearbox is connected to the engine? When I had the car in for a service they said nothing about the K&N anyone any advice? cheers!