Originally Posted by THE TECH
Benvo can verify but I believe 231E was the one that made the difference for many people. Seeing as that's what you've got, no reason to spend more to get 240E unless, like Mike said, you are wanting some performance software. We include the newest software free with all of our performance tunes.
Nothing in particular to 231E is 'special' as opposed to 220E, etc..
It's just on very old software (such as 60E, or 80E) that an update is a good idea.