Purchased for a 1997 Chevy S-10, 4.3L with 32,000 miles. Only offers one tune level. Higher shift points are preset and can't be adjusted. Doesn't offer any monitoring functions, such as 0-60 time or engine conditions. I got spoiled with the SuperCh*ps programmers I had on my last two trucks. Unfortunately they did not go back to 1997 models.