Was the other 240lb your buddy holding a case of beer?
There's nothing you can unbolt, realistically (discounting doors, hood, trunk etc) that'll add up to 300lb (or 250lbs for that matter) Demon weighed all of the realistic stock "unboltables" (rear seat back and bottom, spare tire, car jack, tools) and I don't think it added up to even 100lbs, so I don't buy your 300lb weight reduction.