i too have had very bad experiance with hi-torque!
no where near as bad as 40k gone but when i first bought my 33gtst i took it there for an exhaust and such, had 2500 aside for exhaust and a few other little things. they rang me and told me that the engine had a stud broken and then i needed a new head ect. the head turned out to be second hand also!
i thought well they are a workshop that knows what they are doing so id rather pay them to fix it as im new to cars, 3500 later and i still had a standard car!
they just kept feeding me bull shit, after having skylines for a couple of years now i know more about them and would never recommend anyone to go there!