An exhaust flex hose is a flexible piece of pipe that allows the exhaust system some flexibility. Exhaust flex hoses are an essential part of any front wheel drive vehicle and on most all wheel drive vehicles. On front wheel cars, since the motor is mounted transversely, when you accelerate the motor rocks and the exhaust flex hose protects your exhaust system from breakage. Without that extra flex the rocking motion would crack the exhaust system causing a loud leak. Exhaust flex hoses allow the system to let out air with more air burst. If you’re involved in a crash where you lose control, the compact hose allows for cooler vaporization. A black hose pipe helps keep that even pressure throughout the rear of the vehicle keeping those coolant lines from clogging. According to the National Highway Traffic Safety Administration (NHTSA), the heavy duty rubber hose exhaust restraint system that is installed on all passenger cars is an important part of the system and usually differs for each vehicle. The hose fitting suppliers accessories can be used to attach devices like the starter and alternator. They also contain carbon hoses that plug into the engine and are fitted inside the exhaust system. Along with a hose clip, these devices help prevent spewing of oil from backpasses, hill climbs, and slowing.