A street bike is a type of BMX bike, so your question can't be answered.
Fit street 2 b.c lighter frame but i wouldn't recommend getting a Free Agent Crown Imperial
A true race bike is probably lighter, and may have another brake set up than a "normal" BMX. also you might have different parts that make the bike itself heavier, like if you are comparing a street or dirt bike to a race bike the back rim on the street/dirt bike the axle is going to 14mm instead of 3/8 axle, but other than that theres really nothing but gearing
As a general rule if two bikes are in the same price range, the smaller of the two will be lighter. This because there is less material used in the smaller BMX due to it's much simpler construction. But, when you head for the high end, a flatland or racing bike is going to be much lighter compared to a mountain bike.
There's no telling. The BMX is probably smaller, so it should be lighter. OTOH they're often amazingly chunkily built and can be surprisingly heavy.
freestyle, dirt, street
A hyper is better
Yes
The Black Eye Renegade is a much better bike. It is lighter and more durable.
The RL340, while lighter than Redlines' low end BMX bikes, doesn't quite tiptoe past the scales like the Proline Series and the Flight Series bicycles. But, the RL340 is an incredibly durable bike for the money.
you can find a BMX bike in halfords
The bmx thruster rampage bike is a exellent bike
One can buy a custom BMX bike in Las Vegas from a few stores. One can get a BMX custom made from 'Just BMX', 'Bolder BMX', 'Bike World' and 'Vegas Bike Store'.