Using seatbelt inertia lock while on track...
No harness or bar. See the link below. 4-pt has no anti-sub strap, and is not allowed in many club organized HPDE events. So it's pretty much useless unless you want to look really 'cool' driving around town in a harness.
http://www.schrothracing.com/products/Tuning
http://www.schrothracing.com/products/Tuning
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