Since TS asking for advises whether to get Turbo, you are the devil while I am the angel. Ofcourse, 1 support 1 against. Those custom shops you mentioned, do they even know anything about pressure and air density in the first place? Do they know how to calculate the most optimum flow? Those piping are done with proper measurement or just copy and think got the style means ok. You can set air intake straight but it will not draw the highest volume of air with optimum density before pump into engine. You could draw lots of air but not highest density end up more fuel guzzling.
Excuse me, Forte 2.0 NA will get better FC than turbocharged 2.0L. This is fact. Also, the FC depends on how high the boost. If boosted to 2.4L engine strength professionally by Kia, it'll consume less fuel than 2.4L NA but still higher than 2.0L NA.
When comes to hands of Ah Chong or Ah Meng modify workshop, Lol!! Whatever they do, they are nothing close to what real carmakers could do in reality. Only end up with high FC and more horsepower but less torque. Vios is not made for performance and it is nothing more than a city car. Why take that for comparison?
Do you know what are the function of VGT & Twinscroll Turbochargers in the first place? Ever since these 2 types are introduced, those normal turbo we all know are now labelled as lower level wastegate turbocharger to differentiate clearly from the 2 new toys. What do you know about turbolag?
Pug508 1.6T
output 156ps@6000rpm
torque 240Nm@1400rpm
The turbo activates from 1400rpm onwards. If you think below 1400rpm without turbo assist is lag, that is wrong. Turbolag happens when the turbocharger activated and while operating at 3200rpm and there's sudden deceleration, the pressure from exhaust become low and to allow the turbocharger to continue spinning optimum, the VGT would retract the blades for low pressure mode continue to draw in air. Twinscroll type in BMW has 2 vents, 1 for low pressure and that allows the turbine to keep spinning under similar situation. The older normal wastegate type can't do this.
Talking about maintenance & reliability, do you know those who knows nothing about pressure would end up choking the engine. In long run, wear & tear faster and more often, requiring more cleaning.
Dammit.... you are really STUPID! I tot they just joking around...