2003 Ford Mustang Cobra Xtreme Team Four Valve Cams - Mods For Mods Part 3
1 5/8-inch vs. 1 3/4-inch Kooks Headers
If you check out the Web sites and postings on the Internet, you'll come across a wide variety of opinions on the subject of exhaust systems for the supercharged Cobra motors. Given the impressive power production offered by the supercharged four-valve motors, it is understandable that many enthusiasts would opt for 1 3/4-inch headers, especially on modified versions. Unfortunately, there is much more to the exhaust game than sizing. To illustrate this, we performed a back-to-back test on our modified Cobra motor. Keeping the timing and air/fuel ratio the same, we ran a pair of 1 5/8-inch and 1 3/4-inch stainless steel headers supplied by Kooks. As illustrated by the power graphs, the 1 5/8-inch headers outperformed the larger 1 3/4-inch versions from 3,400 rpm to 5,900 rpm, but lost out nowhere to the larger header. Both headers allowed the motor to produce 620 hp at 6,600 rpm, but the average power production was much better with the smaller 1 5/8-inch headers. View Related Article
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