JonW

Despite non-power seats, aluminum wheels, no sound deadening and presumably no options, the Boss still weighs 30 pounds more than a GT. Where is that weight coming from?

PTRocks

Exhaust side pipes, the finned diff cover, the added front splitter, the larger radiator, the oil cooler, the extra baffles in the oil pan, probably the stiffer anti-roll bars, possibly the adjustable shocks.

Ltngdrvr

Aluminum manifold instead of plastic for one.

#2- Heavier con rods(not much I'm sure but a little)

#3- seats maybe?

PTRocks

I've read the intake is also plastic, though it does have an aluminum cover.

mwilson7

Most of it is probably from the standard 19" wheels/tires vs. the standard 18's on the GT.

Ministang

This plus the "side pipes" are the major weight adders that I can see. If I had to warrant a guess, I'd say the wider wheels and tires are responsible for about 20 lbs of the added weight (5 lbs per corner) and the side pipes for the remaining ten pounds (5 lbs per side). The wheels and tires could be even heavier than my guess though, which would offset some of the missing sound deadener.

MARZ

The beefy, forged pistons are heavier than their cast counterparts, too.

4x4xFord

That front splitter is huge. Make it stiff enough to be useful, and it'll add 5-10 lbs easily.

Fazm

It also says estimated weight. Just wait until it's out for sure

Dr Evil

I thought it was the other way around? Composite shell.

PTRocks

By cover I mean the plate with the embossed logo on the top of the manifold.

Josh69

The brakes, wheels, tires and exhaust are most of it. Even though it doesn't have power seats or the additional options, all the wiring is likely still there which is common practice in today's vehicles, and that is a lot of the weight. For example, you bought a new Mustang without heated seats, the wiring would likely still be under the carpet. At least that's the way it was for my BMW's...it's easier and cheaper for the manufacturer to just have a single wiring harness, than to individualize based on content.