02 We removed the TTI 21⁄2-inch exhaust, and placed it alongside the new 3-inch TTI exhaust. Besides a difference in diameter, the 21⁄2 system was equipped with three-chamber Flowmaster mufflers. We ordered our TTI 3-inch exhaust kit (B30HWM6365) with high-flow DynoMax UltraFlo mufflers (TTI PN DYN17221). The DynoMax Super Turbo mufflers are standard equipment with a TTI system, unless you specifically order the Ultra Flo mufflers. TTI includes instructions, all the brackets, hangers, clamps, reducers, gaskets, nuts and bolts needed to make for an easy installation.