Kawiyowee, I know about the timing being retarded at low speed and that fact isn't what I was debating on, my point was about the max timing the engine could take. Over advance will hurt performance so there is a limit to how much an aftermarket cdi can do. The switch on the VDI ect.. isn't of interest to me, I am looking for best performance and reliability witch is what my post is about. I hope the VDI works well for you, I'm not looking to bash VDI or anyone only curios about other DYNA owners and how there cdi's are doing. But it does seem like a lot of products are put on the market before there perfected. [img]i/expressions/face-icon-small-wink.gif[/img]