I have a diablosport programmer for a 2001 Silverado I would like to get rid of. I never used it for the performance, just to correct the speedo,and for the diagnostics, so I can't vouch for performance gains. It is VIN locked, so you will have to ship it back to Diablosport to have it unlocked. Says on the box it's for 1999-2002 gas Gm vehicles. It has a couple numbers on it, one is U7198, and the other is 129071, I can't remember what they stand for though.. $100 obo. Here are a couple pics.

 

Ttt...