If you are trying to keep costs reasonable, you can use pipes made by RD Logics or Skyline as they are less than $60 for the one-piece style. One of the magazines had a pipe comparison a month or two ago, and if you can find it.... you will see all the pipes offer comparable performance.

You will find the pipe can get dented racing with others and realize the cost to replace is high regardless of your choice. I have used the Skyline, RD Logics, RB Concept & Novarossi one piece systems. All the pipes work well, so its up you and how much $$$ you want to spend.