Is this BS?

[gemex]

Everyone selling the Accufab throttle body and inlets for an 03 are telling me with the 2.8 pulley I'm looking at 30rwhp. I have seen some posts here saying otherwise and save the money. As you can see I’m pretty much at the end of the mods list and wonder if it is really worth the money ($550)?

Anyone with a personal experience, or opinions?

Thanks!