Motorgeek did you mean Poul turner pipe require larger main jets? You said smaller and I'm sure that was a mistake. Any way I did a little handy work on my pipe. Welded a new stinger on there. The problem is the rear cone of the pipe where it meets the stinger is smaller than the stinger diameter. So I hacked it back and re welded the stinger on. Golden

No the unmodified Paul turner pipes will usually require 1 to 4 main jets smaller to make them run clean on the top end.  It depends upon how much porting/how good the porting is.

Any two stroke pipe that is over-restricted either by design, or a dirty spark arrestor, or a silencer that the core is broken or miss-aligned will usually require a smaller main jet to make it run without miss-firing on the top end than a pipe that has the flow characteristics of the stinger/silencer optimized. 

You did the right thing to the tail cone by cutting it off so that it matches the larger stinger.  Make sure that the mid-pipe going to the silencer and the silencer ID is also the same size or larger that the short stinger that is attached to the tail cone.  The larger stinger may hurt the over-rev a little but it will really help keep the piston crown temperatures at a reasonable level.

With your modified stinger and silencer you may need to run around a 500 main jet.