I have a set of nismo headers that have been sitting in the shead forever now(wasnt looking forward to the install ahhh),im going to the shop tonight to install them..i know its a tight space,but if anbody could throw me a tip or anything would be helpful.thanks

 

This should help;

https://my350z.com/forum/engine-drivetrain-and-forced-induction-diy/300513-diy-header-hi-flow-cat-installation.html