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The K&N filters let to much stuff get by. The sensor problem is probably a result of over oiling the filter. There are several aftermarket filters that work well, check a Chev site for the ones that fit. You may be able to build your own BAHF [big honkin air filter] using a stock big truck air filter, if you have room under the hood. The stock filters usually work adequately if they are maintained. A less restrictive muffler is probably the best addon. I added a big truck muffler that doubled the exhaust thruput, it helps keep the turbo temps down.
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