I ran the axial 28RR on my gt1... I would stay away from it!
Have you looked at the picco p3? or the dyanamite big red .28? Theres also some RB Concept engines for under 200
Xray NT1 '08 /'09 EC LRP12R / Serpent 720 '08 RB Concept V12, R3 RB mods, V12 Rody, Matrix RW / Serpent 733, 733TE RB T9 / EA RC8T OS .21 Vspec speed tuned / Kyosho Inferno GT, GT2 / EA SC10 / Serpent Cobra GT coming soon!