I went for a remap there 2 months . Car is so much better to drive I have to say. Had a bluefin remap and panel filter already so in terms of power was pulling decent figures at around 195ish. Remap with centre silencer our and matched inlets pulling 201ish I think on the day. We can argue the accuracy of the rolling roads and who out of RS, K-tec and 519 is most accurate but at the end of the day while the before and after figure are quite close thats realistic. When people claim +10bhp for remap and filter I dont believe it. All I can report is mid range urgency is a hell of a lot better. and it is a lot easier to drive "fast" less gear changes and was reasonable at £299 compared to the other 2 in question. Other thing with 519 is he is honest and happy to talk. I took my car in for brake fluid and pad change. He was honest and said they didnt need them saving me £150ish... Happy to chat whilst working etc... So once you have got hold of him and booked in, cant fault him