Standard Weight for a B4.1

To my understanding it is:

-1oz in front of the tranny (the FT Lipo weight is only .60 ounce)
-1/4 oz in each rear triangle (total 1/2oz)
-1/2 oz next to the receiver to offset weight L/R

For a total of at least 2oz in the car.

Any weight up front is more user preference. I dont know how you can fit 2.5oz in front of the tranny? This is what we have always ran at our local tracks (Competition Hobbies / SRS)