No turbo means no easy power

You can flash an ECU tune, but be realistic - on a naturally aspirated engine you're typically looking at single-figure kilowatts and slightly sharper throttle response, not a transformation. There's no boost to turn up, so the gains are modest and mostly about feel.

Honestly, spend on maintenance and tyres before chasing power. If you want a sharper drive, a quality set of tyres and fresh suspension bushes do far more for the way it feels than any bolt-on engine part on the atmo 2.0.

On the non-turbo 2.0 the gains are small and mostly about induction noise rather than measurable power. A cat-back can wake up the sound, but don't expect it to show up at the wheels - this engine just isn't very responsive to breathing mods.

The Nu 2.0 is generally tough, but keep on top of oil changes - some 2.0 MPi/GDi engines in this family have a reputation for oil consumption as they age. Check service history and watch the dipstick between services rather than relying on the warning light.