thats where its suposed to go (from what they say)
it should cool the exaust gasses so lower the fuel temp, giving a more consistent tune and more run-time since the fuel will be "thicker".
i think we allready talked together about that.

i had a great time running my nitro's in the snow but its too much trouble starting a engine when its -10c, keeping a good tune going thru snow that cools 75degrees off the engine in a second, air filters getting wet... now with my brushed truck i simply oil the bearings/bushings/screws and hit it with compressed air and its done.