p5x : Dyn 086 w/stock header
Novarossi 9886 w/41021 header

21-7 FMS : Ofna 053 w/stock header
9853/41021 or 41005
Sirio 2013 w/stock header

21-plus 4 : Ofna 053 w/stock header
Ofna 086 w/stock header
Novarossi 9853/41005 or 41021
Novarossi 9901 w/41021
Sirio 2013 w/stock header


standard plugs - Odonnell 77, 99 or 100 (MCcoy has a few decent plugs as well but Im not familiar with their ranges)

turbo plugs - I recommend the Odonnell 97T's hands down to any other plug, that's JMO(these pipes/plugs are just what I have used/tried besides the 9901 which I am trying next, so these are just my personal preferences per Monty's recommendations, I have owned/tried all these engines besides the FMS, I had a HES tuned 21-7BT, fastest engine I Have ever seen)...........GL with your new mills!!! Keep up on your air filter system and use a good fuel with a good oil package like Byros Gen 2 30% and these engines will LAST