Hi, I've been looking into performance CDIs for a while and I've read mixed reviews on them; some say that they have gotten good results from them and others say that they are a rip off and / or cause problems with starting and overall performance. Has anyone here had any good experences with them and can anyone reccommend me one that will work with my Sinnis Max, I'm pretty sure that it has to be a 4 pin like this one

4stroke_Vertical125to200ccCDI.jpg

Also is a performance CDI likely to wreck my engine after a while? I wouldn't be red lining it all the time I'd just like to maintain around 9k revs in 5th gear.