i was quoted £255, 3-4 hours to do, i ended up waited all day as it was a busy day at the machinist they use, so they ended up ducting some money of the price which was good of them, there can be power gains depending on how bad they are to begin with, how good the engine is etc, but overall the engine drives alot better. i fink they remap as them building that supercharged 200 and finalising the map next week. oh and they do more than match aswel when i had a quick look at the inlets i notciced they machined all the way into the manifold, where as on my 172 another company only machined the ends.