[Darren69]

Yep, not by much, the stock S4 monster is something like 98/99Hp and the standard 916 is 104hp. not sure what the torque figures are off the top of my head without looking but the tuned or Foggy S4 is 113hp and the S4R with the 996 engine is 115hp standard both make more torque than the 916. Its mental really!

Its mostly in the exhaust system too. my S4 runs a full Termi system that is very similar to the one used on the 888 SBK and that worked really well at the time and probably the most powerful Desmoquattro engine bike they made, so its the best of both really. Guess I'm on the lookout for an S4R motor that I can fit to mine. Will drop straight it too!