Sorry this is off post but you do mention fourstroking and i like to add smilies because aussies tend to say things a bit more bluntly than our american cousins!

Does anyone here have a link to fourstroke exhaust design in relation to fuel pressure nipples and whether they are necessary?..i want to run my saito220 with a short shotgun pipe in a percival mew gull,but am wary of a lean run and throwing a large prop.Any pointers appreciated,cheers