Posted by chris case on Sunday, March 27, 2005 at 10:35AM :
In Reply to: 10 mpg ? posted by djw on Sunday, March 27, 2005 at 9:46AM :
But yes, headers and duals do help in performance/efficiency/mileage. Performance/efficiency/mileage are all the same thing, you might not get better mileage, but you go up hills faster.
Headers, duals, vacuum distributor would probably gain 15-20%. Higher compression would help too.