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 didīnt 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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