Which Turbobacks with cats pass emissions? Right now, my friend is looking for a turboback that can pass emissions and which can be had with more gains in power. The ones he is looking at are the Cobb Turboback, TXS Turboback, and the Vishnu Turbo-Back SS. All these come with the option of having cats. Is the power really that discernible with or without cats? Should he just bite the bullet and go catless on the turboback and keep the stock exhaust in storage when it is time for emissions testing pull it out and install it. Also how hard is it for a total n00b to install a turboback? He has the AccessECU on order.