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Phil 997 said:Hi J, they don't add any more BHP as such what it does is transfer unused power from other areas that have been over engineered by Porsche and that unused energy is converted into a few BHP but on its own it doesnt add much the biggest gain is the increased weight of the steering the 997 has very light steering and that can be disconcerting when cornering etc. the older 911s all had heavier steering and this mod increases the weight of the steering and makes it feel much more connected and gives more confidence when cornering. I wouldn't do it as a stand alone mod but if your lowering and adding semi solid engine mounts, transmission mounts harder bushing and the usual set of power upgrades then this should be considered as part of that over all package along with the other final pull together bits like LTT short shift etc. :thumb: :thumb: