I don't have the Neuspeed pulley. I have the Agency Power pulley because it is oem size not an under-drive like Neuspeeds. Anyhow, all of the pieces you are considering will be difficult feeling noticeable power gains. I have them all, and all were installed at the same time. Most do not feel much if anything from the pulley plus you will be eliminating the harmonic-balancer of the oem one. Anything other than fueling, turbos, and remaps I call "Sum parts". Because the sum of their minimal power increases eventually add up.