Ok, heres the run down. I just got my front oem rotors replaced a few months ago and now my rear ones are wearing out and sqeaking.

I want to know if i can replace my rears with a bbk kit, but leave my fronts oem for a while until i wear them out a little.

so i would have front oem/rear bbk. would it affect my braking? or ruin my car since the stopping capability for front is different than my rear

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I also want to slam my car to the ground. Currently running on eibach pro kit on a g35 sedan with 20x8.5 and 20x10 wheels in the rear.

running on 245/35 front and 275/30 rear.

my fenders are currently rolled. I've heard that I can put some s-techs on there and it would still be fine.

If possible, i want lower.

what do you guys suggest?
cut my springs?

 

With a properly sized rear BBK that keeps the OEM brake bias intact, you could install a rear kit only and not hurt performance significantly. MOST kits on the market however do not do this. I only know of Stoptech which tests for this, or at least publishes data regarding this, so unless you are planning on going with the stoptech rear kit, I would highly recommend against going rear BBK only. You also have to realize you are only saving less than $100 by trying to run your front brakes until they are worn, which becomes almost negligable considering the costs associated with a F/R BBK setup.

 

Front brake are 70% of your stopping power. I'de worry that you might screw up your brake bias and have you rear stop to quickly and do some funky stuff. As far as your wheel/tire combo from everything I've read on here if your rolled you should have no problems with s-techs. I don't know if they'll fit but you can go with eibach sportline springs and they lower G's 1.6 and 1.6for the sedan. check out this car

https://g35driver.com/forums/g35-sedan-v35-2003-06/172938-05-blk-sedan-lowered-eibach-sportline-tokico-d-spec-pics-inside.html