I had 530BB's in my previous Z with MSP manifolds and I was thoroughly impressed on the powerband. I would expect these to have a bit more to offer, which is why I picked them up since I'm after response and mid-range power. That being said, SZ swears by the 2860's, especially if you can run 2.5" intake/IC piping.
1993 Nissan 300ZX Slicktop (Oxford Gray Metallic) 1992 Nissan Skyline GT-R (Gunmetal Gray) - Long Live the Z and Godzirra! - "Love cars. Love people. Love life." - Mr. K.