My point was, the number of draw-thru systems being built is, I think, small, compared with the number of blow-trhru projects out there. I don't remember seeing or hearing about many draw-thru systems lately, although they seem to work equally-well as the blow-thru's insofar as power-production is concerned.. Their main drawback is, nobody seems to want to run an intercooler with them because it becomes, basically,a bomb when full of pressurized air and fuel. KA-BOOM!!!!