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Da Brz
No, that clattering is your flywheel rattling against your pressure plate. Downshift to 1st before that happens. It's not hard to downshift to 1st under 10 mph. I also noticed you've made posts about your car knocking when coming to a stop. Perhaps you are keeping your rpms too low. I think the lowest rpms you should cruise at safely should be about 2500 rpm. There's no reason to almost lug this engine just for muh mpg's when it runs efficiently enough when driven right.