Challenger: ~4200 lbs.
SKY: ~3000 lbs.
40% heavier than a SKY
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Stock Challenger: 425BHP
Stock SKY RL: 260BHP
Lb/HP (lower is better):
Challenger: 9.9
SKY: 11.5
If you can get the SKY to 303BHP, you'll match 'em on stats.
The Challenger uses a 120HP just to lug around the weight difference.