I also have an 09 and noticed a coolant smell after installing the full Z1 silicone kit. Kit was installed in August 2021 and it still smells to this day.
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09 S/T 6MT: AAM S-Line catback exhaust Ti tips, Z1 CF CAI, Z1 ported intake plenum, Z1 high energy coil packs, tuned with ECU-Tek @ Z1: 332whp 261ftlbs
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