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I don't know what the real world mileage on a Challenger is. I can tell you what it is on a S-197. I've got one of those. Yes, I think the S-197 is lighter, but still to get the power of a 500 they not only go up on the cubes, but then they blow it.
I've got to believe (based on what SMS has done) that the Challenger would be hands down faster than the 500 if it came with a puffer as well. Cause I'm betting a SMS 570 will blow the doors off a GT500
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