If I install the LoadLeash Engine Brake on my truck will it make that neat " Jake Brake" sound?
It will not. This style of the engine brake is what the industry calls a "weeper" engine brake, and it similar sounding to an exhaust brake.
When engaged, it holds an exhaust valve slightly cracked, slowing the engine by forcing the pistons to compress and suck air through a small opening, similar to the concept of blowing and sucking air through a narrow straw.
Compression release style engine brakes have an exhaust valve mechanism that it timed to the engine valve train to "pop" off the compression at a certain time which gives off the loud exhaust note, similar to when a pellet gun is compressed then fired.