Got a chip that came on my 03 gt when I bought it. Took it of so I could use my SCT handheld tuner. Should work for all 99-04 GTs(may want to call Diablo and confirm) I dont know what tunes are on it but I did run 87 octane with no issues. You can send it to Diablo and have whatever tunes you want put on it. Price is $75.00 and Ill will meet you in Longview.
