TECHNICAL Exhaust system theory explanation How to correctly size a fuel injector All about spark plugs Tyre bible If you don't go anywhere else, go here and read all the Toyota articles. If you want to know about EGR, TVIS sensors etc it's all right here! Various Celica info Articles from the workshop manuals A 3SGTE engine building/modifying company Thinking of fitting an under drive/lightened pulley, read this first... General EFI info, as well as a guide to building your own wideband lambda sensor... A forum for all sorts of interesting EFI questions An interesting installation article on installing bearings - not directly applicable to the 3SGTE DIY head porting information Emerald's handy guide to engine management basics How to decipher turbo compressor maps Lots of spark plug information