How much heavier? Roughly 300 pounds with the driver. A significant amount yet the car still cracked the 10 second barrier. Here is the mod list:
FuelIt stg 2 LPFP
HFS-4 meth kit
The picture you see in the beginning of this post if of the stealth RB and RB inlets and not the setup on the car that broke into the 10's which is the 'classic' RB stock frame turbo upgrade. Expect even more out of the car when the new turbos go on.
Also, expect more 10 second N54's which should now be common. We also have a bit of a back and forth vendor war going in the stock frame N54 turbo upgrade game which is good for all of us. It should push the limits of what they can achieve. A good old fashioned shootout is getting the platform quicker and faster times on the strip.
Congratulation to @newb335guy and more details in his words below: