Not really....fuel pump, CAI, cam gears and belt and to some extent intercoolers, injectors, brakes and pads. Thats all relatively cheap stuff when it comes to mods. Sub $500 parts besides maybe the latter 3 parts.
When you get into Turbo's, Suspension and Wheels & Tyres it gets expensive. Most people would consider electronics as a major upgrade consisting of maybe a computer, EBC and turbo timer which could come to around $2500-$3000 (thats with a PowerFC and all installed).