I have a redhead 700 with a viper pipe. I use the stock redhead manifold, but I use a SLP can to make it fit under the hood (the stock viper can is too tall for the 700sx hood). I don't have the jetting dialed in yet. It seems flat at the top end. But other then that it runs well, seems to have good power. I might try to get it dynoed this fall. But there always seems to be something else to spend the money on.