I have seen OBX with some stuff for the radiator hoses but OBX hasn't been very reliable in my experience and their customer service is pitiful. I bought some blue Silicone Hoses but then realized that they are "not for fuel or other fluid applications". So if you want to tinker with your vacuum lines.... Unless you want to show your car, I would leave it alone under the hood. Keep it clean and functional and it will give you few problems.