Food for thought: where the weight is loss has a greater impact on vehicle performance than simply looking at the pounds eliminated as a percentage of total vehicle weight.
The best place to lose weight is the wheels, the weights of various wheels would be very good info. I would prefer to eliminate 2.5 pounds at each wheel (10 pounds total) than to eliminate 50 pounds switching to aluminum heads.
The next best place to lose weight are the other rotating parts (drivetrain parts, like axles or brake rotors).
Eliminating weight ahead of the front axle & behind the rear axle is also more effective than eliminating weight between the axles (the "L" bumpers for instance).
George
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