I'm waiting until I install a roll bar and GT3 racing seats to add a 5 point harness. And as yet, I don't know of any harness bar made for the R8. Until then I am using the great CG seat belt lock system. It really really helps you stay in your stock, non-racing seat correctly while going thru hi G turns, and lets you concentrate better on your driving.
Yup, I've got a 4-point Sparco Racing harness in mine. I'm lucky I've got a local motorsport dude that installs on Ferrari and Lambo. Great job, looks original and now I can hit the track even harder!!!
It's not an easy job. You have to strip the inside trims and come in through the engine bay firewall... Not something you can do at home. Since the R8 is all aluminium, you need someone that know how to work with Auminium chassis etc...
I also would be grateful for a head start on the job. bz888, you have had your belts in for months any additional thoughts? Bodhii, are you still in need of a solution? My friend is an Audi R8 cert. tech. and we have a number of good race / tuner shops in the area (northern California) were we could get the work done.
So, photos would help.