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5 inch Mega Intake System against the factory 3 inch intake manifold and passenger side intercooler tube
LB7 and LLY engines will require tuner programming
While the seams are a major point of rust through with some budget systems MBRP fully sealed tubing adds years to your system
NOTE: A stretched
11-16 Duramax Merchant Automotive Allison Maximum Transmissions Turbo 5 inch Mega Intake SystemDescription ALLISON TRANSMISSION OVERVIEW The 5 speed and 6 speed Allison automatic transmissions backing the Duramax diesel engines in GM 2500HD and 3500 pickups is a smooth shifting transmission that works very well in stock applications. But the factory Allison transmissions tend to have issues coping with heavy towing and hauling or even mild performance upgrades not to mention serious struggles with high performance modifications. As the go to
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