Welcome mate. I'm assuming you're wanting to go NA just with a bit more pep? In my humble experience the best way to ruin a good car is to mess with it by putting aftermarket exhaust parts on. The fuel economy goes to hell whether you realize or not and the drone comes in.
If you were going to go down that road, if you can find quality parts cheap second hand maybe that's an option? The petrol barra's do liven up with 98 fuel, an exhaust and a slight tune, but you might be talking less than 0.5 over a standing qtr at ~16 seconds to begin with. Being gas you are maybe power limited again, don't know enough about that.
If you really wanted to give it a shot, you could try a set of cams with an exhaust & tune but then 100% kiss goodbye any fuel economy you may have had.