Which modern engine?

[voucht]

Hi everyone,

I'd like to make a survey:

- if emissions and fuel consumption were a main concern,
- if our Roadsters would have to comply with, let's say, euro 5-6 regulations,
- and assuming that you could adapt a RWD gearbox to the engine,

Which engine, and from which very recent car (brand and model), would you chose for your Raodster?

Thanks.