The main reason cars do this is to heat up the catalytic converters so they start operating efficiently faster. It's an emissions thing as others have said.
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2013 Nissan 370z Magma Red Base w/Sport package 6speed. AAM intakes (S-line for now, still needs tuned), Berk HFC's, ARK DT-S cat-back, CJM baffled oil pan, and FI 34 row oil cooler.
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