Yep, me. Mark Adams of v8 fame worked on my M16 in 2004. Briefly, it already had itg filter and straight through manifold and exhaust. On the dyno 133 bhp. After Mark advanced the ignition, transistorised the ignition and worked with Omex to develop a bespoke ecu, 170 was recorded. Nothing else other than an anti-knock sensor drilled into the down pipe. Mark said there was more power available if I needed it but that I should try it and see how I got on. He said the M16 is a sweet engine and that no one seemed to have had success with a nasp before. If you hunt down "interesting conversation on nasp M16" on the Rovertech site you'll be able to read more. Suffice to say Kevin Vernon thought it very quick. Under 5 secs from a standing start but more usefully loads of go in the gears, no flat spots and builds steam like a train after 4000rpm in fourth. 35 mpg but one can't have everything.