[Mahler9th]

Fuel cell bladders do not have to be replaced every five (5) years.

The answer on that topic is the typical "it depends."

I am not sure that any type of FIA-labeled cell is safer for street driving than the stock tank.

But I do know that the car was designed in Germany with both safety and various gubmint regulations in mind.

I have a '75 that has a fuel cell. The bladder is over 20 years old and it is fine.

It is configured as a race car, but I can drive it on the street as well.

I run high octane leaded fuel, and all fueling is done at my home.