headers don't necessarily "have issues", and in some tight situations they're necessary ... good gaskets properly installed should work fine, and if the ceramic coating doesn't cut the heat enough, there's wrap available that does the job .... headers have been around for decades, and I think you can trust the name brands to know how to design them, they will be 'tuned'

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics