you mean by "constantly". Assuming this is a serious post, I'll say you have some reading to do, so start searching. Look at the "Stage" charts to get an idea of what people do. Althought the ideas of stages is obsolete, it will still give you some ideas to start. There are some things you can do to add power that don't require a lot of money or knowledge, but to beat an M5 you will need a good Z32 shop.