Headers look great,good welds, smooth bends. Feels solid. Instillation was not easy,but with a lift and a fiend to help it wasn't terrible. Combined with CAI, cat back exhaust they really woke up my 2010 Challenger 5.7. The engine spins up much quicker than with stock manifolds. Sound is about the same. Not noticeable louder inside. No dyno numbers but seat of the pants feels like 25-35 more horsepower.
These are awesome mufflers, that sound great, and are supper easy to install. I gave a 4 for appearance because the only way they could be better is if they were polished. I also gave a 4 on price, because let's face it. Who wouldn't want to pay less? Theses really are FLIP'N good cat back system.