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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