Welcome br150 I would start with the 11 gram sliders and the 1500 rear yellow torque spring like miamieddie said. See how the improvement is first and it will only cost about 35 bucks. The parts aren't hard to replace if you have a 3/8 impact gun. I don't recommend a 1/2 impact gun because the nuts only need about 35/40ftlbs max.
Our 2004 blue dune 150 came with 14 gram rollers and when I put in 10 gram rollers and the yellow big torque spring it was a high rpm doughnut making hill climbing machine. The top speed was down almost 10 mph so the 11 gram sliders were the happy middle for speed and climbing. It all depends what works for you so start with a couple mods first. Also the lighter rollers/sliders will use more gas for sure, but well worth it.
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