Just got back from DaSilva ready for e-test. Had Matt do a base tune when I brought it in. IT made 466rwhp on a SCT 4 bank chip. After the guys at DaSilva racing retuned , removed the chip , got rid of all the bugs previous guy had, retuned with SCTx4 made 495 rwhp. Im impressed the guys were great there and did an awsome job. 2002 GT, Cobra crank, long tube headers,pypes high flow cats,Vortec supercharger. Could not ask for better service.