The side entrance allows for better distribution, and reduces the numbers of bends necessary to get air in the engine.
The nitrous placement on the manifold is critical to making the maximum intercooling effect, and is not possible unless you have a progressive system. This allows for infinite control on the rate and amount of nitrous. The thought use to be to place the first stage on the hot side of the intercooler allows a non progressive system to run a bigger jet and use the heat coming out of the compressor to keep from stunting the engine.
With this spray bar you get to use the nitrous to effect maximum intercooling effect , and use the progressive ability to bring it on as boost ramps up, this in effect allows boost and nitrous quantity to feed off each other in a chain reaction
The boss is for a stock fuel filter, and is not on unless you request it. .
You Get what you pay for , and that is a primary reason Ray is covered up, and has two and some times three head porters working on diesel heads, . The real question is can you afford to go else where, the quality of air flow coming out of the airflow engineering department of RayMac is second to none. Chris Frank is the chief airflow specialists, and he is use to working on Pro Stock DRCE III and NASCAR developmental programs , but the diesel market has warranted his attention