I don't think I made a specific recommendation because I thought your question was what the differences were between the Cusco and Kaaz... both Cusco and Kaaz units will chatter though the Cusco will be quieter due to less aggressive lockup. If you are looking for a more streetable diff there is another/quiet option currently available, the Kaaz LSD is still probably the best for drag racing though. Give me a call to discuss your needs and I can go through the pros and cons of each option.