fuel return system?
 

so fuel return system vs a non return system on our cars?

what does our car have factory and what are the benefits of both on our car (boosted or not)?

Stock we have a returnless system. The biggest downside to a returnless system on a boosted car is that you can't easily adjust fuel pressure mechanically without messing with the regulator, which is in the tank. If you run a return system you can put an adjustable FPR in the engine bay and easily change it. You can also increase the flow capacity of the whole system without needing to make a custom in tank regulator.

For an N/A car, I don't think you'll see any real benefits.

So basically since I'm goin boosted just to return system and save myself headaches later?

Also, a return system will help keep the fuel cooler which helps with a boosted motor. No need on an NA application though.

IMO, not needed unless you're building the motor and going for big power. If you're going to keep the stock internals you'll be fine with the stock returnless lines, just a bigger pump and port injectors.