Myself & Greg(dallas) have the Optima...only thing I've found is it's a little shorter than stock. You'll either need to get a couple washers or 'tap' the battery strap down bolts a little. They don't have quite enough thread on them for a snug fit. Other than that it's fine.
: I have a question regarding this battery, will it fit in a 1990 N/A 2+2 as is, or do these batteries need some modification to fit in our cars (extensions to battery cables and so on...)