When the FMF gnarly pipe first came out a few years ago, it was originally called the Burly. I put one on my KTM 200 MXC for a few months and then changed back. With the FMF silencer, the stock pipe made better power everywhere. Also, the FMF pipe never fit well. When the bolt holes were lined up, the pipe always drooled at the exhaust port. I tried new O-rings, silicone, etc. Just my 2 cents. Have you thought about the Doma pipes offered in the KTM hard parts catalog? Grant Langston has been using them for a few years.