www.importintelligence.com - They sell custom gauge & glow needle kits + work on cars. Specialize in SR20DET swaps.
www.rippmods.com - SDS kits for Eclipse, Galant, Lancer, Tiburon, Stratus, Stealth, Sebring, Camery, Celica, Solara, MR2.
www.car-part.com - Used auto parts. Blow your motor? Get one there. Returning to stock and need parts? Get em there.
www.rockauto.com - Great place to pick up plugs, sensors and all kinds of other parts that your local store doesn't stock. Cheap + fast shipping.