2003 Ford Mustang Cobra Kenne Bell Twin Screw Supercharger - Mods For Mods Part 2
Exhaust Test: Stock cat-back vs. Bassani vs. Headers and 3-inch
The three curves depicted here illustrate the power gains offered by changes in the exhaust system. The '03 Cobra motor was run first with the stock exhaust manifolds feeding a Bassani X-pipe (no cats) and a stock Cobra cat-back exhaust. So equipped, the Kenne Bell supercharged motor produced 666 hp and 578 lb-ft of torque at 17.9 psi. Replacing the stock cat-back exhaust with a Bassani cat-back resulted in a jump in peak power to 677 hp and 587 lb-ft of torque. Installation of the Bassani cat-back exhaust upped the power by as much as 12-13 hp while decreasing the peak boost pressure to 17.2 psi (always a good sign). The final test involved replacing the stock exhaust manifolds with a set of Flowtech (Hooker) 1 5/8-inch headers and the Bassani cat-back with a simple 3-inch exhaust consisting of two 18-inch sections of 3-inch pipe (basically collector extensions). The headers and open exhaust improved the peak power output to 682 hp with torque now up to 595 lb-ft. Improving the exhaust flow once again decreased the boost pressure to 16.5 psi. Remember, flow improvements made after the blower (heads, cam or exhaust) will usually decrease boost pressure, while improvements made before (air inlet, MAF and throttle body) will increase boost pressure. Both can result in power gains. View Related Article
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