When was the last time you had to replace your Detroit DD Series OEM exhaust manifold and turbo? Does your DD15/16 suffer from low-end power loss? Have you noticed your fuel consumption increasing? Chances are your OEM exhaust manifold may not be the best fit for your Detroit engine. It’s common knowledge that the exhaust manifold on the Detroit DD15/16 is prone to cracking, leaking and/ or warping. This issue makes your engine less efficient and can also cause additional damage to the engine and decrease engine longevity.