That's a pretty big jump in compression. Should really liven things up, but be prepared to spend a whole lot more than just the price of the pistons. To properly seat the new rings, you'll need to have the cylinders honed, and if you're going that far, you may as well bore it out... where to stop? I'd wait until it actually "needs" to be freshened up before dumpin coin into it, but that's me.
Thanks for the info so far!!
I already have a K&N airfilter with a slighty opened airbox, and I cored out the stock exhaust. Will this be enough to take full advantage of the new pistons? Or do I need better Intake + Exhaust? Also are the 02 M750Sie ECU's remappable? I thought I saw somewhere that they are not, So it looks like powercommander. Or does anyone have any other suggestions?