j.duncker,

What kind of exhaust setup are guys using there on the Irvine's and OS's? Stock mufflers, or something tuned? The stock OS muffler is real power killer, you can pick up a ton of extra power with a mousse can or other tuned exhaust. I'm not familiar with the Irvine's stock muffler, all the Irvines I've flown against had mousse cans or Ultrathrust tuned mufflers. They were powerful, but nothing the OS on mousse can couldn't keep up with.

The Webra on mousse can, however, blows the Irvine and OS out of the water. If you put a carb with a bigger throat on the OS FX, you get more power as well, if you look at the OS carb, it actually has a very small throat compared to many of the others.