The tuning experts at SpeedFactory perfected their version of the new Dodge Challenger SRT8 with an output of over 600 HP, not including a supercharger. With a normal Challenger puting out around 425 Hp, SpeedFactory’s tuning package boosts power by nearly 175hp. To accomplish all this, they took the cars standard 6.1-liter Hemi, bored it to 7.0-liters, and then added a stainless steel exhaust from Corsa and custom Comp. Hydraulic cam with an 85mm throttle body and CNC stock manifold were installed next.