BMW Santa Cruz carrys chips made by Wunderlich, not sure the price, I think Laser has one too. They are in the 300-400 bucks range.
I have the BBPower chip, which is the one imported by Wunderlich as mentioned above. It is more expensive than some, but offers more programs. 1)stock exhaust system 2)no cat, but stock muffler 3)no cat, performance muffler. In addition, there are programs for the above when you have to run lower octane fuel. Progams are changed by switching the provided jumper, which is installed in the fuse box where the CCP plug is or would have been. My $.02 worth is that unless you are running a modified exhaust, don't bother. The configuration for stock exhaust does not seem any better, if as good as stock. I have had a complete performance exhaust on it with the chip, and now run a Sebring "Y" cat eliminator and stock muffler. I find it performs best in the stage 3 config., even though this is supposed to be for performance muffler w/ no cat. What have I gained? Smoothed power curve, less peaky in the middle, stronger at the top, higher rev limiter, and a slight decrease in fuel economy. Also, no muffler pops on decel., which can be a problem w/ modified exhausts. Is the chip worth it? Probably not. Rhine West now makes a chip that is less expensive. Two stages, stock or performance muffler. What is it you want? If it is more performance, you will probably get some slight performance w/ chip, exhaust and K&N, however it is an expensive gain for so little. If it is reducing the surging, try the champion spark plugs. I changed to these last week, and it has been one of the most dramatic changes I have made, and at $3.50, it is the most bang for my buck by a LONG shot. Almost no surging, much smoother, better response. Feels like a different bike. I would not have believed that such a small change could make such a big differece.
Champion RC9YC plugs. The RC9YC4 are the same, just pre-gapped at .04" (you need to gap either one to .8mm). If anyone changes to this plug, post your results. I had tried an Autolite as suggested a couple of years ago, and it actually seemed worse than stock. I would be interested to see if others have as much success with this as I did. Previous posters have said this plug makes a big difference, but I had not tried it until this last week. I still have the BBP chip in, so I would be interested to hear how well it smooths things out for the stock chip.
Surging is not a plug related problem. Sync your throttle bodies at idle and at 2500 rpm and all surging is gone. I do mone at 6000 service. I know have 90;000 miles and never deal with surge
