Still can be confusing for some with this info from the team picco web site:

TURBO COLD GLOW-PLUGS
•P5TC hot filament
•P6TC medium filament
•P7TC cold filament

TURBO HOT GLOW-PLUGS
•P5TH hot filament
•P6TH medium filament
•P7TH cold filament

could some one in the know break down what would be best suited for a picco p3 28 that i run in my monster truck first off and secondly what wouldbe best suited for my picco 21 that i run in my truggy...both have turbo heads fitted to the engines.

I have been using the p5th in the picco 28
I have been using the p6th in the picco 21
Using 30% nitro in both engines
Both engines have been modified also

I am keen to see what others think about my plug choice or if there would be a better choice out there for these engines to perform at there best in the australian - melbourne weather, thanks guys