No... order the tune... wait for it in the mail... get the tune and install all them at the same time. send your core ecm back in the mail. www.nelsonpeformance.com -------------------- eBay Motors: Lingenfelter GT2-3 Camshaft 350-383-427 LS1, LS2, LS6 (item 160242595281 end time Nov-16-08 06:25:59 PST) here is the cam then go turbo.