Noticed on the bottom of this page an advertisement for Thorton Chip. They say stage 3 chip will give you 60 HP and 5 MPG increase for $89 on 5BW. Sounds to good to be true. Anyone have actual experience with this plug and play chip? Work as advertised, sort of work or total BS? PS I have a manual BW so not sure if this affects the gas mileage results compared to an automatic.