Quote:
Originally Posted by Eric K
Even with the jetting dialed in you will have a big difference due to the pipe.
I have used the FMF, Doma and stock GG pipes. The FMF pipe signs off very early. The Doma on my '01 XC300 and the stock GG pipe on my '06 EC300 are nearly identical. The stock GG pipe and Doma are much smoother and have much more top end power than the FMF.
My real world dyno is a hill. On a steep dirt hill, my '01 XC300 with the FMF was only able to pull 3rd gear at a moderately high RPM. When I put on the Doma pipe, I could pull 4th gear screaming at a much higher RPM than with the FMF pipe in 3rd gear. It was a huge difference.
The Doma & stock GG pipe are much better than the FMF Gnarly for my woods trail riding and open sand riding.
Try swapping pipes and see what happens.
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The 08 with the stock FMF pipe doesn't have as much bottom as the the 06 with the stock GG pipe. I suspect maybe it has the RB design head is the biggest reason for the huge bottom end torque
The needle is a mystery also. I'm sending off my head and carb on the 08 to have RB work his magic and then maybe it will run as good as the 06.