I am super happy with the RK Tek head. It was everything claimed, in my experience - ride a gear higher/lug better, runs cleaner, better mileage, more power everywhere.
I just had my stock head milled; if you might go back to 1,000' riding someday, you might want the "Cheater Head". It's the stock head milled to take different dome inserts, so you could easily dial in the right compression for your main riding elevation.
Give Kels a call at RK Tek. He had a Gasgas and tried several mods on it, I'm guessing he can help you get what you're after!
Jeff
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'18 GG XC 300
'05 GG DE 300
'01 GG txt 321
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