is it stupid? or not worth it?? i really want to get those big brakes not just for the looks, but also performance

they are only going to improve your car and make it look fly, go for it.

If you don't track your car then its just an aesthetic improvement, you won't see any significant difference in performance compared to stock, and set of pads/rotors/SS lines will be more than sufficient.

whether or not stopping power is sufficient or not for your driving you will see an improvement with the install, regardless of whether the install is worth it or not. Let's stop using "track your car". The statment makes no sense.

unless you track your car or do a lot of spirited driving, BBK's dont really serve a purpose on any car - 5at or 6mt - besides looking cool

what type of significant improvement will you see then? The main advantage of the brembos is increased heat capacity for multiple rapid stops. Those conditions don't occur normally on the street. Braking distance isn't improved very much because single panic stopping potential is mostly limited by tire compound and weight distribution, not the actual brakes.

Why would any upgrade in brake performance be stupid?

The only real question in my opinion would be is this upgrade worth the money to you?

If I could get hooked-up with some Brembos for my AT G35 at a really good price I would definitely go for it.

try brake with your left foot sometimes. If you dont stop as fast with your right. You have room to improve. if you stop just as fast, then you can get the BBK to stop faster. lol

Go for it. Think of it this way, if Brembo is offered as an option for 2005 and newer for 5AT and 6MT, everybody will get it.

get the STI ones used. they have bigger pistons than the stock G brembos

will they bolt onto the G directly or is a caliper bracket needed as well?

I think they will make your car look nice and stop quick but I dont see the need for a bbk

What are bigger pistons going to do? Brake force is a function of pressure per area, so increasing piston area decreases brake force for an applied pressure. You would have to increase your brake pressure to utilize this added piston size

Like the saying says "one can't have too much hp or big enough brakes".

Since you have an 03, you probably have the smaller older rotors and single piston calipers. Because the oem brembos feature bigger rotors and more piston area, I think you will enjoy a performance increase in terms of lower stopping distances. (along with fade resistance during tracking etc..)

If you had a 05, I'd question the cost/benefit of going to the oem brembos.

But I'd make sure to do a front AND rear upgrade. Only increasing the front braking power often results in worse brake performance as the bias is severly affected.

Well, the bigger pistons need the brembo rotors for our cars to work. Bigger surface area also means greater friction. And frankly they look good. I dont see why not.