http://AutoworldDodge.com 888-377-7193 Powerful. Practical. Efficient. The Challenger versatile engine lineup doesn’t just uphold its legendary reputation – it takes it to an entirely new level. The 392 HEMI is back, in the Challenger 392 SRT8. Its all-new 392 ci SRT HEMI V8 engine produces a staggering 73.4 horsepower-per-liter – the highest naturally aspirated specific-output engine ever offered by Dodge (even more than the fabled 1960s and 1970s 426 HEMI engine 60.86 hp-per-liter rating).