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All M4 systems are designed and intended for closed-course competition use only.

Not for sale in California without proper documentation found Here.

Our systems are provided as is without any guarantees or warranty beyond those outlined in our warranty section. In association with the product, M4 Exhaust makes no warranties of any kind, either express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, of title, or of noninfringement of third party rights. Use of the product by a user is at the user’s risk.

M4 Exhaust