could i place 3.73 gears in auto trans? because thats what i have and i wish i got the 5 speed but u know mothers. Im 16 and this is my first car and love it but lack upgrading information on GTs Ya i hate the fact its a single cam how bout this...a supercharger? or turbo like vortech? Supercharger i see them to be lower in temp and turbos are hot as hell plus intercooler is an plus if u get turbo. So really not looking into a 347 but if i change the cams to a 99 gt set will that mean i need new motor? thx