www.inlinefour.com
www.modacar.com
www.jhpusa.com

inlinefour sells high end performance parts inlcuding jdm manifolds and shit like that. modacar has more accesories. jhp usa sells jdm parts along with performance parts
i like inline four because they are the only site ive found where you can purchase prelude type-s intake manifold and cams. they are also authorized spoon sports dealer. they are pretty much the spoon source in america