You have to get the RX8 Cob though Mazda Maniac. He has an exclusive contract with them for the RX8. And no, other than logging data, you don't get any perks for leaving the Cob plugged into your 8. Regardless, it's not necessary to leave it plugged in for the car to maintain it's tune.
If you get one used, you have to make sure that it's unmarried from the current owners car. Otherwise, Cob charges you like $300 to unlock it.
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My Cars:
1974 RX4 Coupe
1991 FC3S RX7 - Sold
2003 ZZW30 MR2 (Rotary swap after RX8)
2004 SE3P RX8 (20B Swap in the works)
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