Does anyone know a host/datacenter with IP Header Modification (aka Spoofing) enabled?

[Disruptive]

I professionally run a server stress testing service for companies such as PrimaryGuard and am in need of a datacenter/hosting service that can provide dedicated servers with IP header modification enabled. If anyone would be able to point me to a host, or even better own a datacenter themselves and could help me out, I could repay them with a finders fee or rent with you long term.


Thank you!