Ok I didnt want to stick my foot in my mouth so today I hooked up the gps to my sons Tsunami. After some final tuning I wanted to see what this thing really does. The first few runs I was only getting about 36mph. I noticed it was shifting way too soon and when it hit second it would bog down. I guess it was not in its power band once it shifted. I ended up getting the shift point right after about 5 runs. Top speed was 39.2mph. Alot better but still running rich. I leaned it out and did 2 runs and got 41.4mph but the temps were really getting high. It ran 41.4mph on 20% nitro 10% oil. Outside temps are about 92 degrees and truck was running at 280 so I shut it down. Not 45mph but a respectable 41mph. I will richen it back up so his max speed will be around 37mph. So yes a redcat tsunami can do over 40mph.