Bosal Headers vs Stock Manifolds Dyno Data - Torque & HP Comparison Chart

This is page 4 of a 6-page printout (dated 10/27/2001, from http://www.mtco.com/~westcj/Brian/bosal.htm) comparing exhaust header performance on a dynamometer. It is titled 'Bosal Headers' with a section heading 'Stock vs. Brospeed vs. Hotshot Tq Dyno Data.' A line chart plots corrected torque (lb-ft) against engine RPM (2000-7000) for three configurations: 'Dev '94, Hotshot I,' 'Brian '95, Stock Manifold,' and 'Brian '95, Brospeeds.' Torque peaks around 120-127 lb-ft near 5000 RPM and falls off toward 7000 RPM. Below the chart is a table listing vehicle speed (30-85 MPH), engine RPM (2466-6986), and horsepower and torque figures for stock manifolds versus Bosal headers at each point. The Bosal headers show consistent gains, e.g., at 60 MPH/4932 RPM stock produces 116 HP/124 lb-ft vs. 120 HP/128 lb-ft with the headers, and at 85 MPH/6986 RPM stock produces 99 HP/75 lb-ft vs. 109 HP/82 lb-ft. Handwritten notes next to each RPM value mark the HP and TQ gains (1-10 HP, 2-8 lb-ft). A partially legible footer heading references 'Absolute and percent gains in HP (Brospeed headers versus stock manifolds).' A reader learns the measured HP/torque improvement from aftermarket headers across the RPM range.