I have been out of the lt1 game since 2006 and recently picked up a 94 z28 for 1000 bucks. It has the low resolution code stored and is missing a bit. I guess I'm getting back in the opti game now. He said it was replaced a year ago but we all know how that goes. There is a guy on eBay who appears to be knowledgeable and honest that buys and remans optis for a reasonable price. He guarantees his work and hooks it up to a oscilloscope and bench tests it and everything.

 

If any of you are interested I have a opti delete set up I would get rid of it is on a car that was built by GM high tech performance magazine You can google it. Project dirty bird (parting car out other parts available)