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Ford used to say 15 HP gain... By Kevin66 - 04/28/2002 7:58:04 PM; IP 207.102.191.65 ...as a minimum, back in the old Muscle Parts books. In reality, even running through a good dual exhaust system, you'll probably see 20+. More importantly, it's the torque gain that you'll feel, as the pistons no longer have to 'push' all the exhaust gasses through the system, and that energy is freed-up to be used elsewhere. You can also reasonably expect mileage improvements of about 1-1/2-2 mpg over the stock system, at least at cruise or higher.

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Skip Navigation Links.  what's the best header for my 390? -- mike, 04/26/2002  RE: what's the best header for my 390? -- mustangoldtimer, 04/26/2002  You've got a 390IP engine in that car. -- Dave Shoe, 04/26/2002  RE: You've got a 390IP engine in that car. -- Dave, 04/29/2002  RE: what's the best header for my 390? -- Brian, 04/26/2002 Ford used to say 15 HP gain... -- Kevin66, 04/28/2002

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