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Pro's for Helical:
- Cheaper
- Maintenance Free
- NVH Free
Con's for Helical:
- Limited in torque transfer to traction wheel (% dependant on brand of LSD)
- Stops functioning when free-wheeling (although Wavetrac does have their wavelock feature to kind of overcome this)
- Non-Adjustable to your driving style i.e one-size-fits-all
Pro's for Plate:
- Fully adjustable to your driving style (dependant on brand of LSD) i.e Lock Capacity, Engagement/Aggressiveness, Pre-load
Con's for Plate:
- More expensive
- Takes trial & error (and experience) to setup LSD correctly i.e NOT one-size-fits-all. This is why I am hugely against all these oem/oem-based setups being sold by the "other" BMW specialists. If you have to rely on a "specialist" for advice and to setup your LSD for you, then a Plate LSD is not for you. The whole point of a Plate LSD is for its adjustability. If you are not going to touch it, then buy a Helical LSD
- Increased NVH. Unless you don't mind sounding like a tractor in the parking lot, and constant jerking at low corner speeds, these are not for you. Not so bad with an oem/oem-based Plate LSD, but then again, those aren't exactly performance LSD's, no matter what the "specialist" tries to tell (sell) you
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