OilHead
ArboristSite Guru
Do you know where yours is at. Had 3 different saws with nags after performing muffler mods. The 066 with just the addition of the front DP cover was fine but the others that had been opened up just wernt right. The MS 440 that had been walkerized & turned into a 3 port with the addition of the front DP cover was the worst. Had thought about getting larger jets but decided to try this instead. Set the pop off pressure to 15- 17 psi nags went away & they spool up much better.. " AeroCorsair.com " - When you get there click on " Inventions " page then off the list you'll see it Pop off pressure By : Alex Varv. Any one else try this ? 
Shocking isnt it. Really its very simple .
