obd1 all you need to the jumper harness plus an ecu that isnt much, but it depends one what you're gonna get tuned on. if you wanna get tuned on crome or something that would be cheap. S300 is good also AEM Hytech, Motech. etcc but with those standalone you're lookin at 1500++ man. then you gotta deal with the turbo, the manifold, pipings all the little misc stuff. it all adds up. to me 2500 isnt enough maybe it's cause i spent way more than 2500 on my turbo set up. hahahha my turbo alone was 1200