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I have them on my banshee, and yes there is a noticable amount of power, not as great as pipes but pretty good, i would get them, you cant go wrong with them
The best bang for the buck on a Blaster is a 4 degree advance key for $25 from Vito's. I put them on both my kids' Blasters and it makes a very noticeable difference, way more torquey off the bottom and midrange.