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better bottom end to mid range. They are a snappy pipe imo i loved them when i had them, you could gear it differently for the road for some more top end too. if i remember correctly, i think a jet size for every 2k elevation change, close to something like that. So for higher elevation you jet leaner because there is less air, so your mixture is getting more fuel to air ratio. So if your a 290 you could run a 270 or 260.

You could run the pro circuits with the forest approved spark arrestors, i think you will like those better than t6s too as far as that small bog, try turning your air screw in. you shouldnt need a bigger pilot with those mods. Look through the jetting page thats sticky and almost all piped stock bikes are fine with a stock pilot, if your riding in cold conditions you could prolly go up a size but 25 is fine where your at now, try turning the air screw in a 1/4 turn or so