Here is a list of websites to checkout before you post the question,"where can I find performance OEM or aftermarket parts? I'm pretty sure I got them all but if I miss any or some news ones come aviable we will work at getting them added to this list.
HyundaiCanada OEM parts from Canada, expensive but the best parts out there, you might find some of these parts cheaper on Ebay.
AEM SRI
DC Sport Strut Bar
Vibrant Catback Exhaust
Eibach Lowering Springs

KFX Performance Canada Aftermarket parts for Kia Rio and Hyundai Accent. Great prices.
Hyundai Accessory Store USA OEM parts for Hyundai's. Decent prices.
KFX Performance USA The USA version of KFX Canada. Same parts, USA prices.

The rest are sites that have some limited parts or are the manufactures of the parts listed above.
Evofusion USA Limited Parts.
Korean Auto Imports Some Korean parts for the Hyundai.
KSPEC Another Korean website.
SFR Seoulfulracing yet another asian website.
Ultra RacingMakers of some KFX suspension parts.
AEM Manufacture of OEM Strut bar and Short Air Intake.
Eibach Springs Manufacture of Canadian OEM Lowering Spring.
B&I Trim Makers of Canadian OEM interior trim parts.
B&M Racing Makers of the OEM Short Shifter Kit.
Vibrant Performance Makers of Canadian OEM Catback exhaust.
OnderGround Design Makers of the first aftermarket bodykit.

This post has been edited by Komptek: Aug 2 2008, 06:35 AM