The "dillon mini tunnel" gt pro racing tunnelboat. redesigned for 2014 see the new plans. also available: cockpit plans can be adapted to the mini tunnel. Tech support. the best technical support: we will help you succeed! all our plans and kits come with full technical support. ask questions on our support web site. This is the 24" hot shot sprint tunnel hull boat by dumas. the hot shot sprint is designed for a 3.5cc outboard marine engine..