Bulletproof driveline?

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So i have a bmw e81 118i, with a 700hp m50b28, and complete 335i/135i rear end. The car is used for drag/street racing, which is why i am asking for advice for a bulletproof driveline. First time going to prepped 1/8 mile track, it ran a 6.52@113 with a 1.53 60-foot. The problem is, everything is stock. Stock axles and driveshaft. The driveshaft of course shattered on the next pass, which was makes me wonder what other people have used?
I know there is a complete ford 8.8 swap kit, but due to me living in Denmark, it doesn't make financial sense to buy (8-9000$). P.S it isn't a 6 bolt flange on the diff, but the nut design, where the driveshaft is screwed on.