Take for example, Matt Kutchera and his LLY-equipped 2005 Chevrolet Silverado 2500 that was previously modified with a mild lift, upgraded rims and go-fast bolt-ons like a cold air intake, full exhaust and a combination of PPE and Edge tuning components. This isn’t to say they’re not worthwhile modifications on a stock truck, but the return on investment will be much larger with a truck already outfitted with a tuner, intake and exhaust upgrades that are already asking too much of the factory fuel system. Thankfully, Pacific Performance Engineering (PPE) engineered some affordable fueling upgrades that do wonders for modified trucks. But as soon as diesel enthusiasts started wicking them up, it was immediately apparent that the factory fuel feed lines, pressure relief valve, and CP3 just couldn’t handle the load of a heavily juiced-up tuner. “In stock form, the truck had 2.5psi of vacuum, but with the pump in place we had 8psi of positive pressure-how’s that for big gains?”Īgain, this isn’t to say that the Duramax is an improperly designed motor, because they really are great performers out of the box.
However, not long ago, the sentiment that more is better came back to bite some Duramax fans when they realized that nudging horsepower past the 400-hp mark produced diminishing returns, not because the almighty GM mill wasn’t capable, but because it was being choked from fuel for a few simple shortcomings that can easily be fixed with just a couple affordable fueling mods. So naturally, the more fuel trucks receive, the better. Prior to our PPE affordable fueling upgrades, the rig had full exhaust, a cold air intake and a combination of PPE and Edge tuning products.Īs with any diesel engine, more air and more fuel means more power. Matt Kutchera’s LLY-equipped 2005 Silverado 2500 LTZ is fully loaded, has ridiculously low mileage and is as clean as they come.
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