01 William Chang 2013 Kia Optima SX PASMAG

William Chang is no stranger to building cars. Having spent a large portion of his life building JDM, Euro, and American cars, he decided that it was time to venture into something to represent the KDM scene.

06 William Chang 2013 Kia Optima SX PASMAG

At his shop, Concept-3, they hadn’t worked on any serious Kia aftermarket, as the aftermarket support was almost non-existent in 2012 when he first picked up his 2013 Kia Optima SX. This would be their first experiment on KDM modifications.

08 William Chang 2013 Kia Optima SX PASMAG

In its initial stages, as with most Korean car builds in and around that time, the biggest challenge was finding aftermarket parts to support the build in the United States.

02 William Chang 2013 Kia Optima SX PASMAG

After getting some support from sponsors like R1 Concepts, the build began to pick up momentum.

03 William Chang 2013 Kia Optima SX PASMAG

Anyone who immediately wrote them off as a joke for building a Hyundai would soon stop laughing as the KDM sedan went from your average commuter to a full blow daily driven show car.

05 William Chang 2013 Kia Optima SX PASMAG


Owner: William Chang
Location: Brea, CA
Vehicle: 2013 Kia Optima SX
Horsepower: 295hp, 290ft/lbs torque
Club: Concept Nation

Facebook: William Chang
Instagram: @concept3

Upgraded front-mount intercooler
HKS SSQV4 blow off valve
K&N air filter
Torque Solution throttle body spacer
HKS M45XL spark plugs
Custom powder coated hardware

11 William Chang 2013 Kia Optima SX PASMAG

Racepak IQ3S
AEM boost gauge

04 William Chang 2013 Kia Optima SX PASMAG

JUN B.L. exhaust
Megan Racing downpipe

14 William Chang 2013 Kia Optima SX PASMAG

Avant Garde F431 wheels - 20x9.5 +42 (f), 20x10.5 +37 (r)
Michelin Pilot Sport 4 S tires - 225/35/20 (f), 245/35/20 (r)

R1 Concepts 8-piston calipers, 2pc 380mm drilled rotors (f); 6-piston calipers, 2pc 365mm drilled rotors (r); ceramic pads
Motul 660 fluid

12 William Chang 2013 Kia Optima SX PASMAG

Air Force air suspension
Neo Tech sway bars (f/r)
Luxon front strut bar, custom-chromed
Neo Tech camber arms (r)

07 William Chang 2013 Kia Optima SX PASMAG

Garcia Factory lip kit
Seibon hood, trunk
MyRide roof spoiler
Concept-3 rear diffuser
KeenDesign trunk spoiler
Gp_Grahpics roll call and decals
Indy Paints front emblem shave

KDM headlights with FlyRyde demon eyes
Ex-Led taillight blinker with dual reverse light modification with smoke out inserts (Gp_Graphics), interior LED kit
Titan RGB underglow
Sylvania RGB trunk lighting
Center console LED panels

09 William Chang 2013 Kia Optima SX PASMAG

New-Face shift knob
Recaro Sportster CS w/heard option
KDM dual layer floor mats
Cyphier harness bar
Kia Mobis KDM center console
Hyundai Mobis folding mirror module
Hyundai Mobis K5 door sills

10 William Chang 2013 Kia Optima SX PASMAG

R1 Concepts, Ultra Dash, Killerwaxx, Jun B.L., Gp_Graphics, Recaro, Michelin

Rob Soto @ Star Automotive, Brea, CA
Andy Romero @ Firestone La Habra, CA

William Chang's Kia Optima is spotlighted in PASMAG #149. CLICK HERE TO ORDER

13 William Chang 2013 Kia Optima SX PASMAG

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