Super Tigers have given more than few people problems trying to tune, myself included. The carb barrel also jams on a lot of them unless you know how to remove it and machine the rough edges off. This is a fast plane with a 46 on it. Any bigger and it would be scary, especially if you don't have a lot of experience. Actually I have seen some pretty scary speeds even with the 46. If you can afford it and want outstanding performance go with the 46AX. If you want to go a bit less expensive then I would sat the TT46 or 46PRO are very good choices. If it were me I would get the 46AX and not look back!