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Thus, to control on harmful emissions, we recirculate some of exhaust gases back through the intake manifold. Still, it requires good mechanical skill and carefully following the tune installation instructions to ensure everything is configured correctly. Although the initial cost may be high, the kit eventually pays for itself through fuel savings and better performance. Thus, giving you everything needed to tune your truck and keep it running smoothly. The DPF traps and stores soot from the exhaust to lower e