Just thought I would share my experience with removing the "restricter" from my Estoril.
First the basics... Puch Maxi, 80 Gila, home made intake with 21mm Delorto and I started with a 8P.
I wasn't happy with the 8P... loved the top end but most of my riding is around town were low and midrange power is more useful... at least for me.
So I put on the Estoril.... great low and midrange and I was happy... for a while.
But the Estoril really tops out early with a 80 so I thought I would try removing the restricter I read about on the threads.
Only took about a hour to cut it open remove it and weld it back up.
Oh... it really doesnt restrict the flow... if you look at the pics what it does is remove 3 inches of the convergence cone and reshape it slightly and add the 3 inches to the stinger length.
I expected a slight increase in top end power with a corresponding loss in the low end... wrong.
What I ended up with was a honest 5 to 6mph increase in top speed and a big increase in the midrange power. I didnt notice it hit the pipe at any higher RPM than before I modded it but it sure hits the pipe harder now.
Probably the best hour I spent working on my ped in a long time.