Apologies if this has been posted previously, but thought that this was an interesting read. I found some interesting G35 coupe weight reduction tips here: http://forums.freshalloy.com/ubbthre...b=5&o=&fpart=1

Here are some weight reductions options (loosely taken from al503, Russ3Z, Dr Dave, and Eagle1 and edited into 1 single post):
Some weight reduction suggestions from $0 out of pocket to a lot of $$$ in very rough order.
- Remove the plenum and battery cover. ~4 lbs. (3520 lbs)

- Remove the spare tire and associated tools (you'll never need it UNTIL after you take them out.) ~45 lbs. (3475 lbs)

- Remove the back seat if you never use the rear seat, and don't mind how it looks inside without it, remove it. It'll save you about 36 lbs. (3439 lbs)

- Replace the OEM front seats: The Sparco Milano seats dropped about 80lbs here, and they not only are comfortable with their adjustable rake backs and adjustable lumbar features, but you do not go sliding all over the place on a track or in tight corners, so this allows you to relax your shoulders and legs and concentrate on working pedals and steering, rather than bracing yourself, so your control inputs are more precise and smooth and quick. (3359 lbs)

- Replace OEM battery with a lightweight battery. You have a couple of choices here. Go with a lightweight battery from Optima and save about 11 lbs. Go with a super lightweight Odyssey and you can save more than 20. More importantly, you're reducing weight in the nose of the car. (3339 lbs)

- Replace the OEM pulleys. You can save about 5 lbs of rotational weight. Rotational weight is the best to get rid of as each lb you remove you get to multiply. I've heard of everything from x2 to x7. (3334 lbs)

- Replace the OEM exhaust. GReddy SP2 will save you about 21 lbs. A TI single exhaust (y-pipe back) like the JIC can save you about 55 lbs. Cost is an issue here as you will probably have to spend approximately $1200. A hybrid steel/TI single exhaust will save you about 35-40 lbs and split the difference in cost. (3279 lbs)

- Replace OEM flywheel and clutch. You can go absurdly light here saving anywhere from 11 lbs with the Nismo to close to 30 lbs with the lighter ones like the Tilton, however, you may experience "chatter" while idling once the OEM flywheel is replaced. Again, this is rotational weight, which is multiplied and its in the nose of the car. (3249 lbs)

- Replace OEM rims and tires. Lightweight 18" rims can weigh as little as 17 lbs each. The OEM rims and tires are around 24 lbs each. That's a total weight reduction of 49 lbs. The tires tested in C&D differed in weight by up to 3 lbs. That could be an additional 12 lbs of rotational weight multiplied. Pilot sport PS2's are 22 lbs each which are lighter than the RE050A's. (3188 lbs)

- Lightweight rotors. You can get Stoptech rotors and replace the Brembos that will save you a total of around 10 lbs. of rotational weight. (3178 lbs)

- Replace OEM components with Carbon Fiber. I'm hesitant to list carbon fiber as the weight savings in the hood and rear deck is very little (compared to the cost) but you could probably save about 10 to 15 lbs. The stock aluminum hood is already very light. You'll save more weight with a lightweight battery at 20% of the cost of a decent CF hood. If you're doing it for both the weight and looks, not a bad mod. Expect to pay $500+ for a good quality CF hood. CF Door on the otherhand, will save you about 35lbs on each side. (3093 lbs)

So, if you take the average of the weight savings and using a x4 for the rotational weight, you can effectively drop around 500 lbs and most of the vehicle still appears somewhat stock (even the interior save for the seats.) Lets say the stock coupe weighs 3500 and has 298 hp. That’s a power-to-weight ratio of 11.82. (Each pony has to motivate 11.82 lbs.) If you reduce the weight of the coupe to 3093, your power to weight is 10.37. For an idea of what that means the BMW M3’s power-to-weight ratio is about 9.8.

Besides the improvements in acceleration, you’ll also get these side effects (benefits):
1. Better fuel economy and longer tire life.
2. Better skidpad performance.
3. Better braking.
4. Less wear and tear for the car as a whole.