hey i am new here just have a few questions for you people in the know.i have 2005 mini S and i would like to put a 17% pulley on my supercharger, also i would like to remove the catalytic converter altogether,i dont know enough about these ecu's would i need to tune my car? also my harmonic balancer just bit the dust, so i was wondering if anyone has any advice on a straight pulley at the crank, i know these are sold with some promise from the manufacturer, just wondering if anyone has personal experience......