I know upright tanks have to be kept up, and horizontal kept that way. Due to the fact of liquid being injected to the motor, not good! I'm running a PS2K for 15k miles now and I love it. The only down fall is filling you tank. With babies power is always there. Also I heard of babies burning up clutches and detroying trannies if they are not properly modded. With my diesel power chip on extreme she smokes pretty good till the turbo catches up, not as much as injectors and a good chip will though.