ZZP's would be the top "grade" of headers. Least amount of issues, no extra parts to buy, no denting the firewall.
TOG's>ZZP's
In all honesty I dont think one flows better than the other. I think the zzp just looks "cleaner" under the hood.
dont compare the clamps...compare the headers.
TOG's>ZZP's
Nick we're destined to disagree on things!
I switched 2 vehicles from TOGs (1 TOG Xtremes) to ZZP headers and both lost 1 PSI from the extra flow.
The pipes were never aligned properly with the head ports on any TOG header I've looked at.
My ceramic coated Xtremes started rusting and never stopped.
I also hated the leaks from the donut gasket connections, was constantly removing customer's headers, straightening the flanges, replacing the donuts and reinstalling them.