i have a 1996 z28 with lt1 . it has 130,000 miles . i am about to have a tuneup done . should i have the opti replaced . also , i am taking off both the cats . how hard is it to put o2 sims on , appreciate all help . thanks

 

Unless you just have excess money, I would not replace the opti until it is needed. Sims just plug in like an O2.