the lnt and raise its substrate temperature in addition to using in cylinder or external means to increase exhaust gas temperature as fast as possible such as by increasing engine idle speed increasing exhaust back pressure whereby engine load is increased at idle retarding combustion so that the exhaust temperature will be higher or by electrical heating optimizing the location of each treatment device in the exhaust system is also very important ideally an lnt should be positioned as close as possible to the exhaust manifold or turbocharger outlet so that the exhaust gas will heat the lnt first however a close coupled lnt will have lower efficiency at higher engine loads when the lnt has warmed up increasingly high lnt substrate temperatures will result in a reduced capability to the lnt to absorb no x emissions when the lnt is mounted remotely i e further away from the turbocharger outlet it is easier to maintain the lnt substrate temperature for best efficiency under most speed load condition after the lnt warms up however the remote location also contributes to cool down of the lnt during low or light load conditions and accordingly the lnt will lose its conversion efficiency.