How come there is not a Boost Bolt for the 12v Cummins Engine but there is a Boost Bolt for the 24v Cummins 5.9/6.7 Engine?

The reason there is not a boost bolt for the 12v Cummins engine applications is that on the driver side of the cylinder head of the 12v, there is a boost port thread size of ⅛-27 NPT already there from the factory. The 24v 5.9/6.7 Cummins application, the boost port is not available and is why here at Glowshift we designed to Boost Bolt Adapter.