ive heard that it only frees up maybe 5 hp, probably more like 3... i never got it and the pump only weighs like 5 lbs... not heavy from what i remember when i had to install mine, thought of bypassing it, but not sure of how my car might run without it... when i go with the off-road H, im obviously not worried about the emmissions part of it, but will the car run different from what any of you know?