I've owned Mk3's Before that Suffered from BHG and Currently My newest (Prettiest) Project is Doing great but I don't have any Problems as far as BHG.... YET. No Compression issues, Coolant problems, or White smoke.....YET. But as a preliminary Effort I've always heard a retorque and MHG is recommended to save lots of grief later. But As there haven't been any issues With warpage yet is it definently recommended to have a head shop machine it?