Ford Mustang Two-Valve Tuning Guide - Two-Valve Takeover
Header Test-Stock Pi Manifolds Vs. Hooker Headers
While Most enthusiasts think the power comes from the additional exhaust flow offered by long-tube headers, the reality is that the tubing length helps scavenge exhaust from the combustion chambers. The low-pressure zone created helps draw the intake charge, thus improving the power output. If exhaust flow were the only difference, we would not see power gains of this magnitude, nor would we see any gains down low in the rev range. Replacing the stock exhaust manifolds with a set of Hooker headers on this non-PI motor resulted in some serous power gains, from 2,500 rpm all the way to 5,500 rpm. The headers were worth over 30 hp at the top of the rev range. View Related Article
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