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Message: <blockquote data-quote="f8." data-source="post: 112931" data-attributes="member: 923">supergripen,i do not know the specifics of technic's products nor bmw's gearboxes-perhaps i should keep quiet.but you should be aware that the thing that destroys the autobox is torque and not horsepower. and whilst torque is related to boost, there is no guarantee that at whatever the next pulley's psi rating your engine will definitely make that torque which will blow the box.also, the supercharger will make boost in proportion to the square of your engine rpm. that 5.5psi they quote is valid only at a certain rpm. you need to ask what rpm do their kit make that boost on a 325/328?because you will find that if you retain your stock cams, then there is a possibility that at redline when it makes peak boost, the torque may well be less than it is at your stock peak torque rpm or somewhere further up before redline.but anyways, since you already collected the kit, the more pertinent question is to maximise your investment. and in my view, the rm15k or so you pay for say a motec m800 will not only give its own returns, it will also start to squeeze more returns out of your earlier investment on your supercharger kit.the only key to it apart from cost is a good tuner. because technic won't be able to give an optimal off the shelf map. in fact, there is no such thing as an optimal good for all off the shelf chip.</blockquote>