I am running a dual set up on a 230 flattie with the offey manifold. They are easy to work with. There are several different models, so finding 2 that has the right components is hard. Had some problems in getting them together but after we did get them sync. them did a great job. My son finally got them in sync. In the end we had to resize some jets to get them together. I am very pleased with their performance. The little 230 will turn 5500 rpm's to 6000 rpm's with no problem. Hope this helps.
