Its not hype, the JP range of pipes are usually close in producing results as the more expensive pipes. They may not always be the best for a given engine, but for most people its close enough.
Not only that they are alot stronger if you get the hard anodized then most of the expensive pipes. The 2013 is made of Coke can aluminum, its easily dented and the stinger can get beat pretty bad.
I think Jason was actually saying the Go tech engine is not as pipe dependent as most mills are. This was shown via the dyno graph that was realeased by Eb Mods.
Jammin does have an engine line, and they are decent for the price. I think they are Picco based much like the Drake line.