I have been using the Novarossi 2052 pipe with long conical header on the 935RTC. I did test the BP 2012 pipe with BP long and conical header and could not tell a noticeable difference. Lap times were virtually the same. For the 735RTC I think the 2015 pipe with medium header will be good. I will do more testing with the BP headers and pipes as soon as our season starts. I have not had the chance to test any other pipes- Sirio, Picco, Orion, RB, etc.