13 Ecoboost MBRP 4" XP
This exhaust is so bad I don't even know where to start. But to start my truck has a kn 63 CAI. Which is awesome.. The exhaust killed my mpg and power. Feels like it may have a bit more on top of RPM band but from low to mid is terrible. The truck has to stay in gears for longer bc it lost the low end torque. Sound is awful. It sounds like a v6 and IMHO is not good. There is not a lot of difference between a rice rocket and my truck. It is loud tho. Overall I'd pass on exhaust or get the 3".
Great quality. Great price. Fits like a glove. Looks good. Sounds mellow with soft rumble. Intolerable cabin drone between 1700-2100 rpm, which is your most common driving rpm when shifting in town and when cruising on highway (falls between 58-72 mph). To me, this makes it unusable.