I purchased both these items recently but never installed it on the Z. Changed my mind and picked up a CAI and putting the pulley mod off until after some warranty work is finished.
Brand New Stillen Under Drive Pulley (Silver) $110 shipped or $100 picked up. Belt is not included. You can purchase one from Stillen website for $45.69 (400337B).
2. Used Black Z1 Post-Maf Tubes $80 shipped to US address or $70 picked up.
SOLD
Picture as of 10/09/13
Thanks for looking