Thanks for the info. I I don't have a black smoke problem, just the normal diesel exhaust. I just thought it might be a little cleaner since EGR isn't recirculating the exhaust. Just glad I don't have one of the later emissions models with the DPF and DEF systems. Those seem to have a lot more reliability and maintenance issue. Mine specifically is the CM870 versionof the ISX, just EGR on mine.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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