These are my notes from years ago, on hind sight I think I was running too much nitro and/or wrong plug (OS#8), because I remember plug life was a bit on the short side. Webra 35 ringed with Macs muffled tuned pipe, running Powermaster 15% nitro.
16,500 with 9X6 APC
17,700 with 8X8 APC

Note, these are nearly identical results to a same setup OS 32 SX. Fuselage(glass F-3D) vibration was higher with the Webra and extra measures were needed to keep the fuel from churning at high RPMs. The break-in process was longer with the Webra.