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I installed a Schroth Rallye 4 (4-point harness) into my 2013 FR-S and love it. It uses an anti-submarine system which allows your upper shoulders to rotate slightly and keeps your hips planted in the seat. I have it mounted to the front seatbelt mounting points and the appropriate rear seat lower seatbelt mounting points with all original seat belts still in place.
After a full day on the track at Thunderhill, I have no complaints. I was held in place extremely well and was able to completely relax my body and listen to the car as I drove. I have been doing track and AX events for 7 years and I'm a PCA national instructor and I definitely recommend this particular 4-point harness.
Between the length of the straps and some flex in the seat, a full harness attached to a roll bar is definitely more secure. However, I have a CG lock in my 911 and this 4-point harness is a HUGE improvement.
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