the same as the 740s I wish I knew I could have gotten them instead of the 608cc. Ill never need more then the 608cc on my current setup but in the future I may go for pretty big turbos. I would recommend calling Greg at SZ he will tell you what is best. I believe he is going to tell you to get the 740s but dont quote me. He made a post 2 weeks ago I believe about injector sizes in the tech on someones question. Here is his post from 2 weeks ago.