Originally Posted by CdnoilRAM
It won't void your warranty any more than the muffler you have welded in right now, a part has to CAUSE the problem, not just be present on the vehicle. If you melted your rear bumper due to high EGTs then yes...not warranty covered... but for most things, changing the headers/exhaust will not void warranties. If your dealership refuses to touch it cuz it's on then find another dealership since they shouldn't refuse to touch it.
For muffler shops, depending on where you go, but normally they're lower or a comparable price to aftermarket and you know they're made for your truck. Also make sure they have a mandrel bender not just a regular pipe bender, which can crease the pipe, and check their welding...make sure it's seamless, not sloppy tacks.
Someone here definitely knows what he's talking about. Good recommendations. Yes, make sure they have a mandrel bender. Most shops do not because a good mandrel bender is very expensive and you need a technician with experience to do proper mandrel bends. As far as a welder, make sure they have a really good welder fab this up. Any college kid can claim to know how to weld, but remember that these exhausts go through thousands of heat cycles so that can destroy a cheap weld. Be sure you know what to look for. And go with a shop that has experience using stainless steel. Don't go for that aluminumized steel crap. If you do then you may as well have bought a Ford Ranger instead of a Ram. 300 series stainless steel all the way. And if all of that sounds too complicated, just wait a bit longer until Borla or Corsa come out with a rocking set of headers.