Ya i didnt think the leaches increases speed, but the Spider Speed Silencers say they do and i couldnt notice a bit of difference. And as for the "silencer" part, it didnt do anything either. Im not really worried about speed anyways. Ive always believed speed is overrated and want to reduce as much noice as I possibly can, and from what Ive heard the leaches do that. Thanks for the help.