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With or without the coil, it's the tuneup and the optimized timing that adds the performance. The hotter coil does nothing to improve volumetric efficiency so it does not increase the amount of fuel/air mixture the engine burns. You might argue that the hotter coil causes more complete combustion but I seriously doubt that it does. The emissions requirements for unburned HC have already insured that combustion on late model engines is as complete as it can be.
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1996 F-150 XLT, reg. cab 6.5' box, 4.9 I6. E4OD w/ B&M alum sump, auxiliary cooler and external filter, Addco 1" sway-bars F&R, Bilstein shocks, 16 x 8 AR Bajas w/255/70-16s, Line-X spray in liner, hinged tonneau, Reese hitch and electric brake controller, VDO tranny and engine oil temp gages, stainless pushbar, Hella 550 fog and driving lights, Hella backup/work lights, 3.73 Trac-Lok w/ an alum. diff. cover with cap support screws, PFC "Z" brake pads, high flow cat with a 2.5" cat back with a FM 70 muffler.
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