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Old 03-25-2021, 10:58 AM   #5 (permalink)
Special.Ed.61
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Join Date: Jun 2020
Location: Phoenix
Posts: 16
Drives: 2015 370z Touring AT
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Default Hfc's

You don't need a tune immediately after installing them. But you'll want a tune to get the most benefit from your intake/exhaust mods. just make sure that whoever is doing your cats doesn't use power tools/impact drills to remove and install. This WILL kill your 02 sensors. I just went through this.
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Ed

2015 370z Touring AT, Fast Intensions HFC's, HKS Hi-Flow Catback, K&N Drop ins.
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