Does a NGV vehicle benefit the same as gasoline with a performance exhaust? I have purchased a CNG truck with not exhaust. I could go up to a 3" based on the reccomendation of a muffler guy with no cng experience or reinstall a factory 2 1/2." Any input?
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Exhaust System
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Re: Exhaust System
Generally any vehicle will benefit from being able to breathe better. Not being a mechanic/muffler tech I'm not sure what to advise to you. Too big an exaust could eliminate some of the backpressure the engine needs.
Is the truck a Ford?
You might consider a K&N air filter first and see what you get from a less expensive upgrade. A gaseous fuel displaces air in the engine, therefore the reduction in power, even with a higher octane fuel. Therefore, the more airflow the better... a supercharger would give that puppy some umph.
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Re: Exhaust System
Let it breathe. I've got 2.5" true dual pipes no cats 24" cherrybombs and down spouts right before my rear axle haven't had a problem in 50,000 miles. but depending upon where you live at you might not be able to go as free as i can. but it does make a difference and while you are doing this just go ahead and do the whole K&N thing (i wish i could, 5" intake at my CNG carburator.) hope this helped.
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Re: Exhaust System
Larger exhaust reduces backpressure that is used for cylinder evacuation at lower RPM's. If you increase your exhaust size, you will decrease the power at the low end. Larger exhaust helps evacuation at higher RPM's. The same holds true for the intake side. Bigger is better, but only at higher RPM's. The parts are all tied together. What is the RPM range ALL the parts of your engine are designed for?
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