Scott,I usually don't diagree with you but with this I have to.I have to say one of the improvements to our race truck is to go from 14 to 19 and even 21 lbs.The only thing the engine has done to it is bored,stock pistons and the head wacked.Stock cam,stock porting.We are cramming a lot of air in it at speeds with a full ram air system.If you do a fuel injector requirement sheet calculator,you will see even at the old 90 horse ranger need 14.07 lbs of injectors at 43 lbs.If you have a 115 hp 2.5,that number jumps up to a needed 17.03 lbs of injection.We have talked to Accel,RCI and 5.0 Motorsports and they all said the same thing,14lb injectors are fine for the street,never seeing over 4500 rpm,s with no improvements to the motor.14 lb injectors at 5800 rpm,s are marginal at best.We have seen a improvement of almost .14 a lap time with just a change from gray to yellow injector,in fact since the tech guy has found this,the track made a new rule that we couldn't change injectors.I agree,on the street with a stock motor it is a waste of time but with even some minor improvements and given on how plentiful 19lb injectors are,why not put them in,it isn't going to hurt a thing