Hi all,
Resurrecting an old thread. I've just bought myself a 2ZZ swapped MR2 Spyder and it seems I have an adapted 1ZZ manifold which is causing restriction. I'm researching replacement options.
@the_random_hero - did you get anywhere with this? I'm happy to use my car as a test mule. Your design sounds something like the ForcedFed Spec DMC header in this link perhaps?
https://www.boefab.com/blogs/tech/84476422-2zz-ge-header-shootout
If anyone has a set of 2ZZ headers they're selling, please let me know :)
