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The 1 7⁄8-inch tti tubes on top, which have been in the R/T for over three years, had a greater torque advantage over the 2 1⁄4-inch dyno headers. Below, the new 2-inch tti's were worth 8 hp over the 1 7⁄8-inch tubes. Notice the bigger 3 1⁄2-inch collector on the 2-inch, compared to the 3-inch collector on the 1 7⁄8-inch. The higher-horsepower 2-inch tti's will reside in the R/T and bolt up to the 7-year-old 3-inch exhaust.