Bear Intake Exhaust

Will increasing the bore of my air intake and exhaust manifold boost my fuel economy?

I have a six cylinder '98 Ford Ranger, and am debating enlarging its air intake and exhaust manifold which, I'm told, will increase its performance. However, I'm only considering doing it to increase the vehicle's fuel efficiency. I'm getting conflicting answers from self-described mechanics about whether or not doing so will improve mpg, and even those that say it will say the increase will be modest. Still, I'd like to know what the truth is. Anyone wanna take a shot??

Both CAN increase mileage if you tune the engine computer correctly (they make chips / tuners for good mileage). However, is it worth it? If you spend $500 to get 2mpg better (maybe) you'd still paying more because yearly gas bills are probably $3000. $3k x .1 = $300 , thats a 10% saving in fuel economy , which is over what you'd pay normally.

I'd just make sure your tires are inflated.

A look at what is currently available on eBay

YAMAHA YFM350U YFM350F/FW YFM350ER INTAKE EXHAUST VALVE SET BIG BEAR MOTO 4 US $40.95

KODIAK BIG BEAR 400 ENGINE HEAD VALVES INTAKE, EXHAUST US $54.95

Valve Valves Intake Exhaust Big Bear YFM350 YFM 350 US $38.95

24N YAMAHA INTAKE Exhaust Big Bear US $39.99

OEM 87-2011 Yamaha YFM350 YFM40 intake & exhaust valves grizzly kodiak big bear US $48.00

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