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.