Martin, the cross drilled "single vented" discs has about 10-15% more stopping power over stock. I hardly use anything else these days on semi fast cars, except on bone stock units.
When I first tried these on my own 73`super beetle I made a comparison out on a very curvy road and next a VERY firm braking from 100 - 0 mph. The difference is really noticeable. - Instead of the normal shiiiiiiit !, I just kept my foot firm on the pedal. The rear drums did´nt even start rumbling until about 45 mph against the normal 60 mph. And the braking distance was at least 10-15 meters shorter.
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