Dont supprise me at all mate , ive done them myself on a high compression xr3i turbo in 30 mins 😂
but then ive had others last years , so hit or miss really and mine have allways been on road , not track cars . While its working i wont be fixing it i know that my car is at 411 foot pound of torque and touch wood the gearbox is ok so far , i am nice.to it in lower gears tho to be fair