High-quality headers don't make a big difference in absolute terms, but on the other hand, there are visible gains across the ...

GM Performance Parts built a 2,180-hp LSX in 2007 and stuffed it in an Impala, but it never logged any miles on the street or strip. Why?

Lingenfelter’s 7.0-liter upgrade for the mid-engine sports car delivers 700 hp, big torque, and a thrilling NA powerband.