Yeah Ive heard that you get slower spool with the topmount but it really doesnt seem laggy at all. We braced the manifold in a few places and its pretty thick walled piping. Ive heard of people running this type of topmount for quite a while with no problems so I think it should be alright. So far I really havent found any cons about it at all. It was a very inexpensive setup so Im extemely happy with it. Just need to get an exhaust made for it soon. Its really loud!