RE: Thunder Cat 31
every mod that can be done to improve on the tc 31 is here in the form its a long read but you will gain all the knoladge that we have all contributed over the many years this thred a few quick mod are port match the exhaust header cut about 1/2 inch off the rudder less drag make shure your prop is sharp and ballanced open up rear of the hatch to allow air to excape the hull changing the carb will help cant rember the best one but it is in the fourm i run mine with the stock engine as im teaching my 7 year old how to drive with it good luck with the read it si worth it in the long run