jpheaders...and they can be modified to work with all 1mzs....
the only thing about making headers is that it's not just the simple fact of welding and creating a simple set of headers....it takes tuning and engineering too....or else it may not even help at all, or only give you gains at redline, which won't help at all...
don't expect for anybody to buy any until you've made some dyno runs, so don't forget to get some baseline numbers first
hopefully you've thought this out, good luck, and keep us posted