I have personally used a jp-2/3/4. The jp-2 was too much on the bottom, the 3 was good top and the 4 seemed good all around. Personally I run the Mugen 2042. I love that pipe. It is the same as the OS 2060 and Losi RE10. The RE11 is the same as the 2050. All of them are really good pipes. The jp series are definitely much louder than all of the rest though. Now it is just personal preference.