FWIW, trying to mount a 2-point sub strap through the floor is a f*cking nightmare. The underbody isn't flat enough for those big ole washers to lay properly. Ended up with a nice mounting hole in my floorplan before I took another route. Ended up welding a crossbar under my sparco seat frame, wrapped the sub straps around that.
Mounting eyebolts for the waist belts is fairly straightforward, screw one into the stock seatbelt hole. Drill a hole through the transmission hump directly opposite the stock belt hole. Coat one side of the mounting washer with silicone sealant. Put that side facing the metal of the hump, under the car.
For shoulder belts I went the less $ route and got a cipher harness bar for ab 100 bucks. Intend on upgrading to MA Motorsports or some other 1 piece bar in the future.
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'14 MB Nismo | Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs.
Betty Mods
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