Stepper Motor aka Idle Air Control Valve

Engine and Performance

Stepper Motor aka Idle Air Control Valve

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Wira 1.5 A GLI
Hi sifus, i got a question, im not quite sure about my current exhaust mods cant trust those exhaust shops guys la, can anyone advise me on my current setup? Tried modifying few times till running out of ideas

Last time use to have two bullets but now replace with midbox some how feels better pick up! so now my setup is 4-2-1---Bullet----midbox------s-flow muffler
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