Got these last week with the used FI exhaust I bought, I installed Z1 headers as well, these will not work. Up for trades if by some rare chance someone has 350z DE art pipes. The seller claimed 6k on these, there is no issues with the pipes. These are $300 new, Ill ask $200 shipped to lower 48. Comes with a couple of bolts, no gaskets, I throw gaskets away, my recommendation is to use copper hi temp rtv, works wonders 8 bucks at advance.
Where I bought them:
$700 Fast Intentions 370Z Cat Back non res Exhaust w/ Non-Resonated Test Pipes